The problem is this is a game. I don't disagree with the fact that penals don't seem to be true penal squads, and maybe they could be switched with conscripts in name or something, but I think T1 would benefit from some handheld AT.
even though this is a game, i would like it if they stick close to reality as possible. hence, it is why i bought this game. i wouldn't have bought this game if there were little girls cutting down tanks with giant swords. i'm ok with a few realistic things here and there, but not change a unit into something it's not.
maybe instead of giving t1 some AT maybe you could change the whole soviet teching system? the germans do not get t1 AT either. perhaps, make it more easier to get both t1 and t2 together.
or make a new model like soviet marines and place them as elite troops for t1 and give them bazookas.