I don't see the harm within reason...just perk them all to hell and/or relegate them to a single MA.
Heaven forbid that we remember that this is entertainment, not a history lesson.
Also as
humble said, the P-63 absolutely DID see combat with a squadron level deployment, albeit secretly...not sure why it is still not in the game. I agree with everything else he said as well regarding combat ready aircraft that simply didn't find combat. The Titanic Tuesday limitation is a fantastic proposal.
I'm pretty sure C205s never fought Nikis, and I'm pretty sure carrier groups didn't cruise at interstate speeds, but no one seems to have a problem with that stuff...