PhineasBg did something similar with Highlander II.

We called it the kitchen sink edition

Basically, without restoring footage we just spliced every single piece of footage known to man, cannes footage, documentary footage, all known version together.

This created a heck of a long version but was very jarring. However, it was fun to watch since it had all known material. Using the original soundtrack we went back and added footage. We also did this with DUNE - Third Stage

With Dune we had to guess on the what score would have been used for deleted footage. With Star Wars, there is a boat load of soundtracks and audio. For example, I believe the score for the Treadwell scene exisits in audio form somewhere. Some of the audio could be used from the radio star wars for some scenes.

Would be a fun project.

Star Wars - The Kitchen Sink Edition, lol