I remember the destroyer sound effect being brought up in discussion when SirRidley was working on the sound/music for this scene and there were a few attempts at making this change. Unfortunately none of them felt entirely seamless and so the idea was dropped from the final edit.
As for the reshuffled Snoke scene, your thought process is quite close to mine. In my hopefully-soon-to-be-finished edit (which uses Hal’s as a base) this change is implemented.