The issue is, of course, the footage and the music. Only “I am all the Sith!” and the back half of “…scavenger girl is no match for the power in me.” have shots of Palpatine’s face, unfortunately; so one of those has to be his last line - unless you choose to put “you are nothing” over the tension-building silence before Rey speaks.

My previous mockup was just done messily in stereo and with music from the OST, so it wasn’t usable in a 5.1 edit. It also noticeably omitted Palpatine’s final thrust of lightning just prior to the big pause and Rey’s lines. Thus, I have produced a second mockup.

This one is clearly much worse paced, with a big awkward silence, but that’s because I’ve kept it 100% in sync with the original version of the sequence for now in order to keep the music entirely intact. The big thing I did with this mockup (besides 5.1) is to combine the ending of the original “I am all the Sith!” Palpatine shot with the “…scavenger girl…” shot, so I could have Palpatine still do his big blast of electricity.

I’ve been messing with “I’m a Jedi” for ages and also am never satisfied with it. No matter how much I shift and fade the clipped up bits of the line, it still sounds hurried - or, at worst, like she’s saying “I’m the Jedi” or bizarrely even “I’m with Jedi”. There’s certainly no way to get her to sound defiant or triumphant saying it, unless you totally replace it, because the original line is said with a sort of subdued surprise.