Actually, "Star Wars: Redubbed" might be a WHOLE LOT of FUN. Like that one Woody Alen film whose name eludes me, or "Kung Pow." But to keep it centered, I'd keep a few characters (probably Obi, Aunt Beru, and Leia) as their normal voices, just for contrast. Couple that with Cockney Artoo and subtitled Chewie, this could be extremely silly.
And also, every time a lightsiber ignites, there should be a power chord and a high pitched heavy-metal scream (I'm thinking ManOWar!)