I think the Dooku joke works but perhaps it could be intercut with shots of Star Wars characters drinking to avoid repeating too much footage of Dooku.
You could even use some of Ewan's Moulin Rouge stuff to instigate a duet of sorts.
How does rotoscoping his mouth from Captain Invincible footage or maybe putting his Star Wars beard onto material from that film grab you (too much like hard work)?
It would help with the lip synch.
Adding a beard on here would make it useable during the conference scene.
The Wicker Man is full of little bits of dialogue which would be useful it also has more songs.