They already have 0.75 rec acc modifier.
If you want to give them armor, you'd have to strip that first.
That's something you should test because that is pretty hard to discuss based solely on the stats itself but I pretty much expect that the value must be changed if they get any armor.
Moreover, there basically was a single unit in ww2 that actually used body armor, which are soviet assault engineers aka shock troops.
If this mod should be realistic than you are right. If it sticks to realism but not completly, armor wouldn't be that bad for the purpoe of creating a CQC-squad.