Quite frankly, I think the band hasn't figured how to play the song live...
When it first debuted, it was The Edge on piano and no guitar for Bono. Then it became roadie (can't remember his name) on piano, The Edge on guitar (some new guitar parts), full orchestra (Milano), and no guitar for Bono. Then it went roadie on piano, The Edge on guitar (with more new guitar parts, specifically the intro), fake orchestra, Bono on acoustic. Finally, it became The Edge on piano, no orchestra, and Bono on acoustic.
The best version is the third version, which is the closest to the single version.
Anyway, the point of all of this is that Bono has often noted (earlier in the tour) that they are "still trying to figure out how to play the song live." Maybe that's still the case... I reckon that the song will be played again, and so will Crumbs.