You can download the full Music and More album on iTunes for £7.99. It's available in the iTunes+ format which is better sound quality than the standard 128kbps iTunes rips and it's free from all the normal user restrictions.
I pre-ordered Music and More and it's en route as I type but I've downloaded a few tracks just to keep me going until the CD gets here.
Hopefully it'll pave the way for more Twin Peaks downloads in future. If it's not financially viable to release a third CD the download only option would be the next best thing.