Bingowings said:short of reshooting the films how could your ideas be converted into dialogue, footage and slipped into the material that already exists?
Stealing and re-purposing footage from all three movies in the PT and tweaking them as needed to fit (de-greying Obi-Wan, or adding a beard, losing a Padawan braid, etc.)... CGing some meat puppets with synthetic nervous systems to fill in action scenes and whatnot. I was rattled by the fact that, in ROTS, I empathised more with the Clonetroopers than the flesh-and-blood actors. I also know plenty of people in the Rebel Legion and 501st who would be delighted to shoot new footage to insert, as well. Degree of technical hassle would need to be addressed for each scene in turn.
With most of the changes suggested here there are possible technical solutions to putting those dreams onto the screen.
That was my thinking. Dream big, and then see whether it can be done, how easily, etc.
--Jonah