Maybe it would make sense to do 1 and 3. And then an optional special features disc for people who went with option 1 because they have issues with BD50s.
edit: I think I was confused about the difference between options 1 and 2. The non-DTS audio tracks, though numerous, are quite small. I would just have a BD25 with audio/video that is the untranscoded version from 2.7, and maybe a second BD25 with special features. As another option, a BD50 that combines it all together.