Not sure if this was already addressed, but why do you want to remove the Order 66 montage?
It has been explicitly stated:
Problem is, you have to take the films on their own, and in that case, the music and the emotion of the whole montage is way out of whack with our investment in these non-characters. Plus, I feel like cutting around to random planets that we’ve never seen before is rather un-Star Wars. Basically, the sequence had to go.
I could probably write an essay with a word count in the thousands as to why I think this is the right change to make for me. Suffice to say, while Star Wars has always been a story with an epic scope, its always been rather grounded and focused in on the main characters and their stories. The Order 66 montage breaks that convention and tries to reach for some (in my opinion unearned) emotion that, in my version of ROTS, I don’t want to have that be a factor at this point in the story.