Given the way the scene plays out, I don’t intuit a great deal of value in adding several people checking in by name. I may, however, want to add a few miscellaneous exclamations of “Skywalker!” at some point to tie into that part of the story.
And I don’t think the battle over Coruscant theme fits over the scene better than what was there originally.
Yes! To make it like it was Luke’s sacrifice that inspired people, a nice way to tie in with TLJ. I also think the music it’s fine the way it is, it’s one of the most important themes of the saga, it makes sense in the final battle. It’s not just another battle theme.