Huh, didn’t even notice that he wasn’t zapping her. Where did that lightning come from?!

But for this idea, I imagine that Rey advances with the two sabers against Palpatine. Some of her lightning begins to strike his head and blinds him, and then she does one push with them which sends the lightning over his head to hit the throne. Cut to the wide shot and the throne lighting up with this power. Cut to the shot of Palpatine’s head disintegrating in time with the throne, and then Rey sends that final push of lightning which pushes right through the disintegrating Palpatine and hits the throne full-on.

Maybe three shots would need to be altered, tops. The only reordered shot would be to put the wide shot of the throne right after her first push, before Palpy starts to really go to pieces.