Like this, I think.
That would be so incredible! And since it would be longer than their usual set because most of the songs are on the long side, they could tour only stadiums and do a limited number of shows.Maiden has enough material for a full symphonic concert.
This is my dream setlist with a full orchestra and chorus:
1) The ides of March (orchestra only w/ Nicko)
2) Phantom of the Opera
3) Seventh son of a seventh son (+ chorus)
4) Sign of the cross (+ chorus)
5) Blood Brothers
6) Dance of death
7) The clansman (+ bagpipes)
9) Alexander the great
10) Mother Russia (+ chorus)
12) Rime of the ancient mariner
13) Empire of the clouds
14) Hallowed be thy name (+ bell)
15) Fear of the dark