I wonder if it would be possible (or even a good idea) to change the twist into that Rey was a clone made by Palpatine to give his soul a new body. Might be able to be accomplished by adding a few Rey bodies in the tanks with the Snoke bodies.
Keeps the same energy as her being his granddaughter without having the question of who the hell did Palpatine hook up with. Also keeps continuity that her parents were “nobody”.
Rey being a clone would’ve been a far, far better plot point than her just being “a Palpatine.” It was really a stretch how they had to make Rey’s parents still be “nobody” yet still explain the granfather link.
In fact, having the Dark Side vision Rey actually be real and be a clone would’ve been far more interesting, too. Probably too hard to do with current VFX editing, though.