I like it! Both of them, really - two story lines. Do the two lives of Harry Potter/Evans need to be resolved? Could he spend his life in two lives? I would love to do that (I think). To explore the road not taken is tempting. Of course, in his AU Harry didn't even take a road - he was never born - so not really living the same life in two ways as he sort of was in Universal Chaos. This is really just inserting himself into a second life.

Both lives wouldn't have to be real. A dream world where Harry works out some of this issues and therefore does better in the real world would distinguish it from UC. It would lessen the complications. Don't muzzle it! Your imagination got you this far - I say let it go even farther. It is a fertile field!