FWIW, there appears to be a Cantonese and Thai dub on the Hong Kong Blu-ray set. That plus the official Korean subtitle translations make that set pretty interesting to me. If anyone happens to be sitting on this set, send me a PM and you can be my best friend forever.

The dubs should be no harder to despecialize than our Ukrainian audio--perhaps easier since we don't have to deal with perfectly syncing the English audio accompanying the Ukrainian overdub. ROTJ should be a piece of cake, SW somewhat hard, and ESB will be a complete bear.

AFAICT there weren't any dubs in these languages prior to the Special Editions (or else they'd have been on the Region 3 GOUT, I figure), but I'd be delighted to be proven wrong.