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.
I think putting “you are nothing” over the silence would be a good idea as Rey would respond more quickly to saying she’s is a Jedi, which I think helps even more to remove the Endgame-ness of it. Are you able to mock that up?