Alright, came up with another addition that does everything you guys said the Ki-43 does, and even better, it adds something thats significantly different from what we have now:
Panzer III Ausf. L.
For that matter, so would a StuG III, IAR 80C, or G.55.
An He-111 would do everything but add something significantly different. We could also do with a better EW bomber for the brits, and the Russians are still missing a level bomber.