How about moving the opening of TROS to the opening of TLJ?
This changes Kylo Ren’s motivation throughout the movie and, adding the failed Snoke clones, would serve as an enhancer to why he wipes out Snoke when he has a chance with Rey and moves to consolidate his power base.
I had the exact same idea. Remove the first throne scene with Snoke and Kylo (we can have the “assault on Mustafar to get the wayfinder” scene as part of Kylo’s training mentioned in The Force Awakens), remove the shot of the Star Destroyers rising from the ground, remove Sidious telling Kylo to kill Rey, remove the awkward “camera zooming into D’Qar” shot (since it will be jarring if we cut from the scene with Sidious and Kylo to said zoom-in shot), and cut immediately from Sidious telling Kylo that “Rey is not who he expects” to the opening “Oh no” scene on D’Qar.