Well my plan for "Boba" is as follows.

1. When Zev is shot by the dart, her dying words are "Fett" much like in attack of the phantom how she said Kamino Star System.

2. This mean that when Obi is on Kamino and hears of Fett he becomes suspicious, calls yoda, and is told to bring him for questioning.

3. Obi goes to find Boba on the landing platform and recognizes the outfit (and the fact Boba is shooting at him :P )

4. Boba gets away, but Obi follows him to Geonosis.

5. His part in the battle is the same, but when he jumps down to fight Mace he drives him back slightly, leading to the footage of all the jedi being rounded up. The Republic Army attacks, and Boba is not seen again till Empire.

In order to pull this off I've completely removed the scene where Obi meets Boba/Jango in their room, matted young boba out of every shot in Geonosis, and I'm currently matting Jango's helmet on top of his head so we never once see his face.

Here's a test clip: http://www.youtube.com/watch?v=LehtVEd-cTI

This clip is an early proof of concept, so the picture quality changes a bit as it goes on, but the general effect is there.