Rename them to "siberian reserve" and hide their weapon-up-greade like @Elchino said: Satchel requires Molotov upgrade. PTRS requires AT nade upgrade.
Now we can make a real penal-troup for a future commander or revamp.
u could just call them strelki...
what penals need is less earlygame powerspike and more lategame scaling....
i propose to give the new "strelki" a copy of the volksgrenadier KAR and target size and a normal grenade + satchels removed from strelki... but 6 man instead of 5 man priced at 280mp.... with 2 exclusive upgrades panzerfusillier style...
a lategame AI the ability to upgrade to 2/3 DP-28s (depending on what seems balanced)...
a mutually exclusive antitank upgrade with AT satchels + regular satchels and PTRS + rifle sprint (not oorah)