Well, I posted that idea cause I thought that it would actually be something that Lucas would actually do. I agree that it is a lame one seeing as how we have a clone story already. I was thinking along the lines of the dark empire comic series from dark horse. The one where luke fights a clone of himself taken from his severed hand from ESB. I also see how this idea is a bit of a cop out.

I think that one of the best thing to do is to make anakin's character more splintered. It would support statements made by Vader in ROTJ like "That name no longer has any meaning." I always thought that that line was the Vader personality trying to keep the Anakin personality in check or something. Make it almost as if a singular event has such a strong impact on him that it fractures his personality. It would actually have been better if you saw this in the middle of AOTC.

This could also re-enforce obi-wan's statements to luke about his father.