Unlink/Reset stand-alone messages

[luca1396]

Hello!
I wanted to know if there is the possibility to unlink modules outputs from a stand-alone message after having previously linked these messages to it.
In my simulation I would like to have different values of Navigation accuracies via simpleNav. So I set up a couple of SimpleNav modules with different accuracy values. My idea was to create an event to selectively attach the desired module output to a stand alone message. However, I can't figure out how to unlink all the different simpleNav modules output and select just the desired one to be linked again. What happens is that the last module added to the task overwrites all the others.
I don't want to create multiple tasks to solve this issue cause I saw that when Spacecraft and SimpleNav are in different tasks (even if the have the same update rate) the output provided by the simpleNav module is different with respect to the case in which they are all in the same task.
Can anyone help me?
Thanks a lot!

Luca