One idea I had was going all-out with changes in Episode I, which is a prequel 3-in-1. Then the Cassian Andor show is Episode II, followed by Rogue One as Episode III.
As I said on Discord, that wouldn’t really work as a trilogy. It’d just be a standalone film followed by an unrelated duology.
I agree with everything NotTheDr0ids said. To really work as a trilogy, it needs the same core cast and not too big time skips.