Come on, Arachnid, I'm usually on the same page as you 99% of the time, but who the hell will care or notice that Carol wasn't the CM who fought Thanos that one time in the comics? It's neither "shoehorned" or "unnatural". Mar-Vell has been dead in the comics for a long time now and no one is really fuming.
Besides, the MCU at this point is a completely alternate universe to the Marvel 616, which is now getting destroyed as we know it anyway, further making the point moot.