Personally I'd like to see Bela come out and play because of the international influences that he shares with David. Both musicians have traveled around the world to play with incredible instrumentalists on 6 continents... Yonder's fun but I think they are by far the most overrated band at the Festival..No offense!
But if I could have it my way? Byrne comes out with Adrian Belew on the guitar, Tina Weymouth on some backup. Bela helping , and Sammy addin' his special touch. Then throw in the guy on the banjo-uke from the Horseflies, and play the first side of 'My Life in the Bush of Ghosts' followed by Almost any 'Heads tunes....
PS- Shawn Colvin sings 'Home' from an old Heads album...maybe he'll call her up as well....
Well, except for the part about Younder (to each their own) I like the way you think about music.
Auntie Hope