My whole thing about Chris Evans' Cap, is that he had his happy ending with Peggy and lived a full life with her. Then she died and now he's an old man. We're not sure where he's at or what he's doing. So to me, if they were to bring his 616 version back with let's say...Smart Hulk's time machine that can de-age someone, I honestly wouldn't have a problem with that. I don't think it ruins his happy ending because he's already filled that gap in his life.
I know some people will feel different about that. If they go the route of a variant, I'm fine with that too.