Personally, I’d prefer it if it was just an uncut series edit where the only changes are the appearances of the Inquisitors to how they look in Rebels and having Anakin and Obi-Wan’s faces de-aged in the flashback scenes to how they looked in AOTC, and keep it all in 4K HDR with Atmos sound. I’m probably not gonna get it, though.
Once all the material is available this would be extremely simple to put together in a free NLE. You could leave the audio as is and just replace the clips you want with the new stuff.