Okay, since the question has been asked, I'm taking a break for a few days to keep my eyes from buggin out of my head as I stare day after day at the screen in Photoshop. I'm painting Dooku out of one of the scenes, one frame at a time, and the toughest part will be maintaining some semblance of the action that takes place in the background behind Dooku in the far window to the outside. Vader will then be inserted in his place, giving us Vader (from ANH), Obi-Wan, and Anakin (both from ROTS) in the same four and a half second sequence. Not a lot of time, I know, but considering the learning curve involved, I need to take this slow and not screw it up.

I can only hope the end result of this entire scene will be worth the process I'm trying here. Depending on how well this works, I might use similar techniques for adding Vader into more sequences in Dooku's place. Wish me luck!