But isn't there any method to distinguish recruited generals from FMs?
A couple of ways might work. But, again, that would require reworking the traits file since there's a lot of things that get spawned for recruitable generals in the original EB code. Not to mention all the different cultures and factions.

You have to get that feature in without breaking all the rest.

It could turn out to be a simple addition of a line that has a requirement that a gov4 building must exist. However, you would still need a level 5 MIC. Is there really a point to having a local puppet governor if you have to transfer generals from other places to there, or to have to wait to build a level 5 MIC?