The two different shows idea falls in line with what I had discussed earlier about the band simply practicing their war-horses a bunch and slipping them into different nights. One night gets With or Without You while the other gets I Still Haven't Found What I'm Looking For. One night gets Out of Control while the other gets I Will Follow, etc.
They really have enough easy to play songs that it wouldn't be that hard to pull off. If they play the same six new songs every night, plus the four that everyone expects (Where The Streets Have No Name, One, Beautiful Day and Vertigo), that means they would only need about 12-14 tracks to rotate between the two evenings.
Boy - I Will Follow, Out Of Control
October - Gloria
War - New Year's Day, Sunday Bloody Sunday, 40
The Unforgettable Fire - Pride, Bad
Joshua Tree - With or Without You, I Still Haven't Found What I'm Looking For, Bullet The Blue Sky, Running To Stand Still
Rattle & Hum - Desire, Angel of Harlem, All I Want Is You
Achtung Baby - Mysterious Ways, Until The End of the World, Even Better Than The Real Thing
Zooropa - Stay
All That You Can't Leave Behind - Elevation, Stuck In A Moment You Can't Get Out Of
No Line On The Horizon - Magnificent
non-album - Invisible
That's a decent bunch right there of 23 tracks that can be rotated in and out with relative ease.
Exchanges Between The Two Nights
I Will Follow - Out Of Control
New Year's Day - Sunday Bloody Sunday
Pride, 40 (as closer) - Gloria, Bad (as closer)
With Or Without You - I Still Haven't Found What I'm Looking For
Running To Stand Still - All I Want Is You
Desire - Angel of Harlem
Bullet The Blue Sky - Until The End Of The World
Mysterious Ways - Even Better Than The Real Thing
Stay - Stuck In A Moment You Can't Get Out Of
Elevation - Magnificent