I spent six hours last night trying to get R2 re-colored in AE. Unfortunately I won't be able to do it with my limited skill. 75% of the shots through the films are probably fairly easy to fix, but its the other 25% that will pose a big issue for me. An example would be the very first shot of R2 in my version: he appears on the hull of the ship to help with repairs. The amount of movement, as well as the blue planet of Naboo behind him, is causing massive problems. The AE tracker loses tracking points, plus R2 rotates causing the matte to change.

While I would love to be able to change R2's color I can't do it at this time. If there is someone more skilled in AE that would like to take a stab at it PM me and I can provide a sample clip to see if you can do it. If you can perhaps we can work together to recolor R2.

So, for the time being at least, the edits will be released as-is with a blue Astromech Droid.