Even so, I assume the songs themselves were basically written so I wouldn't have thought it'd have been that hard to throw some vocals on the backing tracks to finish them off. It didn't take long for them to release Our Prayer as a stand alone so I'll count that as a track they could include, which would give you:
Heroes And Villains
You could even stick He Gives Speeches on there. That's a decent chunk of album to get going with. Stick on the new tracks they did for Smiley Smile and I bet no one would've even noticed the band was having problems.