Is there a setup that allows editing the (English) base language of Windows RC files?

[JustSwiftIt]

I was able to use a setup using an intermediate language file in Weblate 4.14:

• File mask: *.rc
• Source language: English
• Monolingual base language file: en.rc
• Edit base file: Yes
• Intermediate language file: src.rc

However, when I attempt to set up a component like this in 5.8.3, I get

Editing template is not supported with this file format

This seems to happen due to the check added in acc61eb.

Should the check added in acc61eb apply to my setup with an intermediate language file?
If so: Is there a different way to set up a component using Windows RC files and still be able to edit all languages?

This was the setup that seemed to work in Weblate 4.14:

[nijel]

No editing of source RC files is not supported.