I had a look and it already has subs for the despecialized editions, however they seem to be mixed in with the other versions of the movie, making them a little tricky to find: www.opensubtitles.org/en/search/…/idmovie-458
Maybe there’s an easier method, but I filtered by language and then used the browser’s “find in page…” to locate the ones with “despecialized” tags