Something I’d love to see is Dooku being added to the funeral scene in TPM and possibly even to the scene of the Jedi (and Palpatine) landing on Naboo. And while doing that, you could also replace the horrible Samuel L. Jackson double who looks nothing like him but plays Windu in that scene.
These things are probably quite hard to do but I thought I’d throw the idea out there just in case.
My edit of TPM (“Shroud of the Sith”) has Dooku added to the funeral scene. I haven’t released it yet (still working on a few things), but I have a link to preview the Dooku funeral scene somewhere in the thread for my edit. The preview is a bit more rough than the final version, but you’ll get the idea.