If all you care about is gameplay, alter the G43 stats so that it matches the current IR STG profile.
If you care about the aesthetic, Ost caps at 1943, so they don't get IR STGs.
In no situation is giving out IR STGs to Ost actually a good idea. It's not an excuse, it is expliciy how Ost have been designed as per the game's developers.
If you want stormtrooper buffs you can argue for them, but it'll be the G43 that gets them.
Well then i suppose you wouldn't mind removing stg44 from pg's since it did not become standard issue equipment for pg's till 1944.
Brits were designed by the devs to be this static faction with OP emplacements that does everything. Oh.. were are they now.
If your going to talk without thinking like a moron then you should not talk at all.