Considering those facts, and the fact that the entire Sequel Trilogy takes place over the course of only a year, makes me feel like if you made a trilogy edit where most of the action takes place beyond New Republic territory, and the Republic is never destroyed, it wouldn’t really impact the films that much.
FWIW my edit removes any planet killing weapons or mentions of the New Republic outside the title crawl and it really doesn’t. If anything I found by narrowing the scope of the narrative in this way, it helps the story significantly!