[Paragon]

I can do this by setting the two or three armors to misbehaving to their armor type (even though those don't show on the display) and then setting a pick-req to their proficiencies. Interestingly, an exp-req doesn't seem to work unless I did some other error. But that's clearly not how banded mail and the ones already working are doing it, so if anyone who knows how its actually supposed to check for those (I suspect its a procedure somewhere), please let me know.

Edit: Just to be clear, the only armors that appear to be misbehaving are studded leather and ringmail, so if you looked at the others you wouldn't see it, Cryptoknight.