I agree with what everyone else is saying about your latest idea, Nev. The whole “dark side or death” conflict is a stroke of genius, but the rewritten Ochi exposition is more confusing than anything (mainly because it feels like a complete non-sequitur to D-O having “a ton of information about Exegol”). Maybe we could just cut out the “D-O has the information they need” plot point entirely, and imply that the info about the nav tower came from Hux’s message at the beginning of the movie? It would remove one additional twist from this needlessly convoluted plot, at least.

Either way, I think if we’re gonna go with the whole “Rey Palpatine is a lie” idea, the revelation that it’s a lie should be delivered by Palpatine himself, in a classically villainous “I lied!” fashion. The final anime beam clash does seem like a pretty nice place to put it: it’s the resolution of the plot stakes, so it should ideally be the resolution of the emotional stakes as well.