Mickey Mouse Works (16:9 HD version, 1999-2000)

Your best bet is Disney+. There is an official request form for movies/shows/shorts you want to see added to the service. Hopefully, everything would be added in the highest possible visual quality, so if the show was produced in HD and those prints are still in Disney's possession, that's what we would get.

However, note that despite official claims to the contrary, not everything presented on the service is "uncut," "uncensored," or "presented as originally shown" (Fantasia has a disclaimer to the effect of that last quote, but it is still presented in its butchered form, without Sunflower) nor is Disney+ going to have all G through PG-13 productions owned by Disney available at some point (they've already stated that Song of the South and Commando Duck will never be added, end of story). So there's always the chance that even if Mickey Mouse Works is added, "Minnie Takes Care of Pluto" won't be included.