The biggest hurdle to a Rey Nobody edit is the simple question of “what is Rey’s personal arc in this film?”
In ROTJ Luke is trying to save his father.
In TROS proper Rey is grappling with the true lineage within herself.
With the footage we have available to us what does Rey emotionally have to contend with? Why would she reach such a point of anger to strike down Kylo the way she did? What does is the reason she is so upset at Kylo during the Skype fight?
I like the idea of Rey killing her parents since that would be something she doesn’t want to accept. But I don’t feel like that is a good enough reason for her to reach the point of anger on the Death Star that she did. Honestly, with her character, that revelation of her evil with also being a Nobody would probably cause her to freeze instead of fueling her to fight.
I don’t really have answers to these questions but I think about them when perusing this thread.