I really think that Neerb’s idea is the best bet. Not just for Rey Nobody (although it would be significantly easier to cut the Granddaughter stuff out of that version, I think) - it just makes for a stronger film. One of the main failings of TROS is that things just…happen; there’s no investment, no audience engagement, no subtlety. I think it falls flat because (among other reasons) there’s nothing in it to make the audience care. To make them want to watch. If we add a bit of mystery to the plot, it will make the 90 minute fetch quest much more interesting; there will always be that thought in the back of the audience’s mind, “What’s Palpatine’s plan? What’s Kylo Ren going to do to her?”

And I know Hal has said he wants to keep the connection between Snoke and Sheev; I really do disagree. Palpatine’s immediate goals are different than Snoke’s - Palps wants to possess a new Force user, Snokey Boy wants to conquer the galaxy. The Final Order is really just Kylo’s incentive to help deliver Rey to Palpy. From that lens, it makes sense that Snoke and Palpy have no connection. (Maybe there’s even a way to imply that Kylo coming to Exegol is what “awakens” Palpatine? Like, him entering the temple causes the lights to flicker on, and the GLaDOS machine to activate? That would explain why Palpatine has been MIA for the entire trilogy.)

Not to mention narratively, it’s a huge crutch right out of the gate to try and ret-con the previous two movies. Palpy already feels like a last minute addition (because he is). I honestly think it would be stronger to just acknowledge that fact, lean into it, and move on, rather than come up with some convoluted backpedaling for it.

Just my two cents. Obviously I can’t speak for everyone.