Ok so Batman and bat family get yanked out of Gotham for 30 days.
The following "heroes" get ported in to clean up Gotham they have 1 month. (all at same time but not same gotham ie Batman is gone for a month all heroes have equal chance at clean up without stepping on each others toes)
And for fun Deadpool
At the end of 30 days Batman shows up and looks to see what changes happened.
Who was most successful, and which Hero do the citizens of Gotham want to stay? (Batman or one of the others)