I don’t see any reason to mess with Luke and Leia. The Jedi ghost thing seems to be less of a ‘true essence’ and more like ‘hey wow I found a way to teleport into ghost world and stop aging from where I was.’ Hayden-ghost notwithstanding.
Yeah, I agree with Hal, plus I like that they put Leia in the white robes from ANH. I don’t think any reused footage could look better than what we already have.