I now have more concrete information on the Hong Kong Blu-rays. There does not appear to be a Cantonese dub (too bad!), but there is a Thai dub, and some Korean subtitles (among some other subtitle options you can find elsewhere).
The Thai dub voices over the crawl, but does not voice over Greedo (haven't checked Jabba yet), so I'll need to make a subtitle track to accompany the dub, once it's synced.