If something like that were done, you would have to simplify the message to the only thing everyone agrees on: just release the originals.

If you complicate the message with things like not liking prequels & changes, it becomes subjective and easily dismissed, and it doesn't even truthfully represent the views of all fans.

I would avoid like hell any even slight implication that he doesn't have the right to alter his films, because that's red meat for his counter-message. In fact, we should try to disarm him by explicitly stating that he does have this right and that we fully support it. It might complicate the message a bit, but it would be worth it to state it unambiguously.

EDIT: Argh, beat to the punch by... well, everyone.