diff --git a/keyboards/bastardkb/charybdis/3x5/keymaps/via/keymap.c b/keyboards/bastardkb/charybdis/3x5/keymaps/via/keymap.c
index d701dbcd0b59..f15fe1bd683c 100644
--- a/keyboards/bastardkb/charybdis/3x5/keymaps/via/keymap.c
+++ b/keyboards/bastardkb/charybdis/3x5/keymaps/via/keymap.c
@@ -45,31 +45,6 @@ static uint16_t auto_pointer_layer_timer = 0;
 #endif  // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD
 #endif  // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
 
-enum charybdis_keymap_keycodes {
-#ifdef VIA_ENABLE
-  POINTER_DEFAULT_DPI_FORWARD = USER00,
-#else
-  POINTER_DEFAULT_DPI_FORWARD = SAFE_RANGE,
-#endif  // VIA_ENABLE
-  POINTER_DEFAULT_DPI_REVERSE,
-  POINTER_SNIPING_DPI_FORWARD,
-  POINTER_SNIPING_DPI_REVERSE,
-  SNIPING_MODE,
-  SNIPING_MODE_TOGGLE,
-  DRAGSCROLL_MODE,
-  DRAGSCROLL_MODE_TOGGLE,
-  KEYMAP_SAFE_RANGE,
-};
-
-#define DPI_MOD POINTER_DEFAULT_DPI_FORWARD
-#define DPI_RMOD POINTER_DEFAULT_DPI_REVERSE
-#define S_D_MOD POINTER_SNIPING_DPI_FORWARD
-#define S_D_RMOD POINTER_SNIPING_DPI_REVERSE
-#define SNIPING SNIPING_MODE
-#define SNP_TOG SNIPING_MODE_TOGGLE
-#define DRGSCRL DRAGSCROLL_MODE
-#define DRG_TOG DRAGSCROLL_MODE_TOGGLE
-
 #define ESC_MED LT(LAYER_MEDIA, KC_ESC)
 #define SPC_NAV LT(LAYER_NAVIGATION, KC_SPC)
 #define TAB_FUN LT(LAYER_FUNCTION, KC_TAB)
@@ -233,64 +208,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 };
 // clang-format on
 
-/** \brief Whether SHIFT mod is enabled. */
-static bool has_shift_mod(void) {
-#ifdef NO_ACTION_ONESHOT
-  return mod_config(get_mods()) & MOD_MASK_SHIFT;
-#else
-  return mod_config(get_mods() | get_oneshot_mods()) & MOD_MASK_SHIFT;
-#endif  // NO_ACTION_ONESHOT
-}
-
 #ifdef POINTING_DEVICE_ENABLE
-bool process_record_user(uint16_t keycode, keyrecord_t* record) {
-  switch (keycode) {
-    case POINTER_DEFAULT_DPI_FORWARD:
-      if (record->event.pressed) {
-        // Step backward if shifted, forward otherwise.
-        charybdis_cycle_pointer_default_dpi(/* forward= */ !has_shift_mod());
-      }
-      break;
-    case POINTER_DEFAULT_DPI_REVERSE:
-      if (record->event.pressed) {
-        // Step forward if shifted, backward otherwise.
-        charybdis_cycle_pointer_default_dpi(/* forward= */ has_shift_mod());
-      }
-      break;
-    case POINTER_SNIPING_DPI_FORWARD:
-      if (record->event.pressed) {
-        // Step backward if shifted, forward otherwise.
-        charybdis_cycle_pointer_sniping_dpi(/* forward= */ !has_shift_mod());
-      }
-      break;
-    case POINTER_SNIPING_DPI_REVERSE:
-      if (record->event.pressed) {
-        // Step forward if shifted, backward otherwise.
-        charybdis_cycle_pointer_sniping_dpi(/* forward= */ has_shift_mod());
-      }
-      break;
-    case SNIPING_MODE:
-      charybdis_set_pointer_sniping_enabled(record->event.pressed);
-      break;
-    case SNIPING_MODE_TOGGLE:
-      if (record->event.pressed) {
-        charybdis_set_pointer_sniping_enabled(
-            !charybdis_get_pointer_sniping_enabled());
-      }
-      break;
-    case DRAGSCROLL_MODE:
-      charybdis_set_pointer_dragscroll_enabled(record->event.pressed);
-      break;
-    case DRAGSCROLL_MODE_TOGGLE:
-      if (record->event.pressed) {
-        charybdis_set_pointer_dragscroll_enabled(
-            !charybdis_get_pointer_dragscroll_enabled());
-      }
-      break;
-  }
-  return true;
-}
-
 #ifdef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
 report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
   if (abs(mouse_report.x) > CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD ||
diff --git a/keyboards/bastardkb/charybdis/4x6/keymaps/via/keymap.c b/keyboards/bastardkb/charybdis/4x6/keymaps/via/keymap.c
index 9a6e7d6d7008..5cd1cceee03c 100644
--- a/keyboards/bastardkb/charybdis/4x6/keymaps/via/keymap.c
+++ b/keyboards/bastardkb/charybdis/4x6/keymaps/via/keymap.c
@@ -42,31 +42,6 @@ static uint16_t auto_pointer_layer_timer = 0;
 #endif  // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD
 #endif  // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
 
-enum charybdis_keymap_keycodes {
-#ifdef VIA_ENABLE
-  POINTER_DEFAULT_DPI_FORWARD = USER00,
-#else
-  POINTER_DEFAULT_DPI_FORWARD = SAFE_RANGE,
-#endif  // VIA_ENABLE
-  POINTER_DEFAULT_DPI_REVERSE,
-  POINTER_SNIPING_DPI_FORWARD,
-  POINTER_SNIPING_DPI_REVERSE,
-  SNIPING_MODE,
-  SNIPING_MODE_TOGGLE,
-  DRAGSCROLL_MODE,
-  DRAGSCROLL_MODE_TOGGLE,
-  KEYMAP_SAFE_RANGE,
-};
-
-#define DPI_MOD POINTER_DEFAULT_DPI_FORWARD
-#define DPI_RMOD POINTER_DEFAULT_DPI_REVERSE
-#define S_D_MOD POINTER_SNIPING_DPI_FORWARD
-#define S_D_RMOD POINTER_SNIPING_DPI_REVERSE
-#define SNIPING SNIPING_MODE
-#define SNP_TOG SNIPING_MODE_TOGGLE
-#define DRGSCRL DRAGSCROLL_MODE
-#define DRG_TOG DRAGSCROLL_MODE_TOGGLE
-
 #define LOWER MO(LAYER_LOWER)
 #define RAISE MO(LAYER_RAISE)
 #define PT_Z LT(LAYER_POINTER, KC_Z)
@@ -136,64 +111,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 };
 // clang-format on
 
-/** /brief Whether SHIFT mod is enabled. */
-static bool has_shift_mod(void) {
-#ifdef NO_ACTION_ONESHOT
-  return mod_config(get_mods()) & MOD_MASK_SHIFT;
-#else
-  return mod_config(get_mods() | get_oneshot_mods()) & MOD_MASK_SHIFT;
-#endif  // NO_ACTION_ONESHOT
-}
-
 #ifdef POINTING_DEVICE_ENABLE
-bool process_record_user(uint16_t keycode, keyrecord_t* record) {
-  switch (keycode) {
-    case POINTER_DEFAULT_DPI_FORWARD:
-      if (record->event.pressed) {
-        // Step backward if shifted, forward otherwise.
-        charybdis_cycle_pointer_default_dpi(/* forward= */ !has_shift_mod());
-      }
-      break;
-    case POINTER_DEFAULT_DPI_REVERSE:
-      if (record->event.pressed) {
-        // Step forward if shifted, backward otherwise.
-        charybdis_cycle_pointer_default_dpi(/* forward= */ has_shift_mod());
-      }
-      break;
-    case POINTER_SNIPING_DPI_FORWARD:
-      if (record->event.pressed) {
-        // Step backward if shifted, forward otherwise.
-        charybdis_cycle_pointer_sniping_dpi(/* forward= */ !has_shift_mod());
-      }
-      break;
-    case POINTER_SNIPING_DPI_REVERSE:
-      if (record->event.pressed) {
-        // Step forward if shifted, backward otherwise.
-        charybdis_cycle_pointer_sniping_dpi(/* forward= */ has_shift_mod());
-      }
-      break;
-    case SNIPING_MODE:
-      charybdis_set_pointer_sniping_enabled(record->event.pressed);
-      break;
-    case SNIPING_MODE_TOGGLE:
-      if (record->event.pressed) {
-        charybdis_set_pointer_sniping_enabled(
-            !charybdis_get_pointer_sniping_enabled());
-      }
-      break;
-    case DRAGSCROLL_MODE:
-      charybdis_set_pointer_dragscroll_enabled(record->event.pressed);
-      break;
-    case DRAGSCROLL_MODE_TOGGLE:
-      if (record->event.pressed) {
-        charybdis_set_pointer_dragscroll_enabled(
-            !charybdis_get_pointer_dragscroll_enabled());
-      }
-      break;
-  }
-  return true;
-}
-
 #ifdef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
 report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
   if (abs(mouse_report.x) > CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD ||
diff --git a/keyboards/bastardkb/charybdis/charybdis.c b/keyboards/bastardkb/charybdis/charybdis.c
index 3e7088a0580a..dcefbd9bd404 100644
--- a/keyboards/bastardkb/charybdis/charybdis.c
+++ b/keyboards/bastardkb/charybdis/charybdis.c
@@ -254,6 +254,17 @@ report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {
   return mouse_report;
 }
 
+#if defined(POINTING_DEVICE_ENABLE) && !defined(NO_CHARYBDIS_KEYCODES)
+/** \brief Whether SHIFT mod is enabled. */
+static bool has_shift_mod(void) {
+#ifdef NO_ACTION_ONESHOT
+  return mod_config(get_mods()) & MOD_MASK_SHIFT;
+#else
+  return mod_config(get_mods() | get_oneshot_mods()) & MOD_MASK_SHIFT;
+#endif  // NO_ACTION_ONESHOT
+}
+#endif  // POINTING_DEVICE_ENABLE && !NO_CHARYBDIS_KEYCODES
+
 bool process_record_kb(uint16_t keycode, keyrecord_t* record) {
 #ifdef CONSOLE_ENABLE
   dprintf(
@@ -276,6 +287,53 @@ bool process_record_kb(uint16_t keycode, keyrecord_t* record) {
   if (!process_record_user(keycode, record)) {
     return false;
   }
+#ifdef POINTING_DEVICE_ENABLE
+#ifndef NO_CHARYBDIS_KEYCODES
+  switch (keycode) {
+    case POINTER_DEFAULT_DPI_FORWARD:
+      if (record->event.pressed) {
+        // Step backward if shifted, forward otherwise.
+        charybdis_cycle_pointer_default_dpi(/* forward= */ !has_shift_mod());
+      }
+      break;
+    case POINTER_DEFAULT_DPI_REVERSE:
+      if (record->event.pressed) {
+        // Step forward if shifted, backward otherwise.
+        charybdis_cycle_pointer_default_dpi(/* forward= */ has_shift_mod());
+      }
+      break;
+    case POINTER_SNIPING_DPI_FORWARD:
+      if (record->event.pressed) {
+        // Step backward if shifted, forward otherwise.
+        charybdis_cycle_pointer_sniping_dpi(/* forward= */ !has_shift_mod());
+      }
+      break;
+    case POINTER_SNIPING_DPI_REVERSE:
+      if (record->event.pressed) {
+        // Step forward if shifted, backward otherwise.
+        charybdis_cycle_pointer_sniping_dpi(/* forward= */ has_shift_mod());
+      }
+      break;
+    case SNIPING_MODE:
+      charybdis_set_pointer_sniping_enabled(record->event.pressed);
+      break;
+    case SNIPING_MODE_TOGGLE:
+      if (record->event.pressed) {
+        charybdis_set_pointer_sniping_enabled(
+            !charybdis_get_pointer_sniping_enabled());
+      }
+      break;
+    case DRAGSCROLL_MODE:
+      charybdis_set_pointer_dragscroll_enabled(record->event.pressed);
+      break;
+    case DRAGSCROLL_MODE_TOGGLE:
+      if (record->event.pressed) {
+        charybdis_set_pointer_dragscroll_enabled(
+            !charybdis_get_pointer_dragscroll_enabled());
+      }
+      break;
+  }
+#endif  // !NO_CHARYBDIS_KEYCODES
 #ifndef MOUSEKEY_ENABLE
   // Simulate mouse keys if full support is not enabled (reduces firmware size
   // while maintaining support for mouse keys).
@@ -287,6 +345,7 @@ bool process_record_kb(uint16_t keycode, keyrecord_t* record) {
     pointing_device_send();
   }
 #endif  // !MOUSEKEY_ENABLE
+#endif  // POINTING_DEVICE_ENABLE
   return true;
 }
 
diff --git a/keyboards/bastardkb/charybdis/charybdis.h b/keyboards/bastardkb/charybdis/charybdis.h
index 57f3f9dee7c0..b75d152ba5ac 100644
--- a/keyboards/bastardkb/charybdis/charybdis.h
+++ b/keyboards/bastardkb/charybdis/charybdis.h
@@ -31,6 +31,33 @@
 #ifdef POINTING_DEVICE_ENABLE
 #include "quantum.h"
 
+#ifndef NO_CHARYBDIS_KEYCODES
+enum charybdis_keycodes {
+#ifdef VIA_ENABLE
+  POINTER_DEFAULT_DPI_FORWARD = USER00,
+#else
+  POINTER_DEFAULT_DPI_FORWARD = SAFE_RANGE,
+#endif  // VIA_ENABLE
+  POINTER_DEFAULT_DPI_REVERSE,
+  POINTER_SNIPING_DPI_FORWARD,
+  POINTER_SNIPING_DPI_REVERSE,
+  SNIPING_MODE,
+  SNIPING_MODE_TOGGLE,
+  DRAGSCROLL_MODE,
+  DRAGSCROLL_MODE_TOGGLE,
+  CHARYBDIS_SAFE_RANGE,
+};
+
+#define DPI_MOD POINTER_DEFAULT_DPI_FORWARD
+#define DPI_RMOD POINTER_DEFAULT_DPI_REVERSE
+#define S_D_MOD POINTER_SNIPING_DPI_FORWARD
+#define S_D_RMOD POINTER_SNIPING_DPI_REVERSE
+#define SNIPING SNIPING_MODE
+#define SNP_TOG SNIPING_MODE_TOGGLE
+#define DRGSCRL DRAGSCROLL_MODE
+#define DRG_TOG DRAGSCROLL_MODE_TOGGLE
+#endif  // !NO_CHARYBDIS_KEYCODES
+
 /** \brief Return the current DPI value for the pointer's default mode. */
 uint32_t charybdis_get_pointer_default_dpi(void);
 
diff --git a/keyboards/bastardkb/charybdis/readme.md b/keyboards/bastardkb/charybdis/readme.md
index 2c6fe8ae34b8..acd32c353a95 100644
--- a/keyboards/bastardkb/charybdis/readme.md
+++ b/keyboards/bastardkb/charybdis/readme.md
@@ -156,3 +156,55 @@ The acceleration factor can be further tune _via_ the
 ```c
 #define CHARYBDIS_POINTER_ACCELERATION_FACTOR 24
 ```
+
+### Custom keycodes
+
+The Charybdis firmware defines a number of keycodes to leverage its features,
+namely:
+
+```
+#ifndef NO_CHARYBDIS_KEYCODES
+enum charybdis_keycodes {
+  POINTER_DEFAULT_DPI_FORWARD = SAFE_RANGE,
+  POINTER_DEFAULT_DPI_REVERSE,
+  POINTER_SNIPING_DPI_FORWARD,
+  POINTER_SNIPING_DPI_REVERSE,
+  SNIPING_MODE,
+  SNIPING_MODE_TOGGLE,
+  DRAGSCROLL_MODE,
+  DRAGSCROLL_MODE_TOGGLE,
+  CHARYBDIS_SAFE_RANGE,
+};
+
+#define DPI_MOD POINTER_DEFAULT_DPI_FORWARD
+#define DPI_RMOD POINTER_DEFAULT_DPI_REVERSE
+#define S_D_MOD POINTER_SNIPING_DPI_FORWARD
+#define S_D_RMOD POINTER_SNIPING_DPI_REVERSE
+#define SNIPING SNIPING_MODE
+#define SNP_TOG SNIPING_MODE_TOGGLE
+#define DRGSCRL DRAGSCROLL_MODE
+#define DRG_TOG DRAGSCROLL_MODE_TOGGLE
+#endif // !NO_CHARYBDIS_KEYCODES
+```
+
+Users extending the keycode set themselves (either in their keymap, or in their
+userspace) must start at `CHARYBDIS_SAFE_RANGE` to avoid conflicts, _eg._:
+
+```c
+enum userspace_keycodes {
+#ifndef NO_CHARYBDIS_KEYCODES
+  MY_FIRST_KEYCODE = CHARYBDIS_SAFE_RANGE,
+#else
+  MY_FIRST_KEYCODE = SAFE_RANGE,
+#endif // !NO_CHARYBDIS_KEYCODES
+  MY_SECOND_KEYCODE,
+  …
+};
+```
+
+To disable the custom keycodes, and reduce binary size, simply add a definition
+in `config.h`:
+
+```c
+#define NO_CHARYBDIS_KEYCODES
+```