Batman: Arkham City - Explorable Arkham Locations MOD 

hopefully and maybe one day. perhaps it'd use Arkham Knight's environment tht already seems to have a fully rendered/modeled arkham asylum. though maybe not bc i doubt the entire map of asylum was recreated to save on memory

I will, soon.

Use “teleport” command and look where you want to go, everything should be loaded but in a darkness.