Didn't we see several Mosul banks just get flattened by our airpower and we saw cash flyering everywhere? IMO, I don't think many Mosul banks still exist. (just the rubble maybe)
What if after the liberation, clearing and mopping, the bulldozers clear off a couple spots around the city and "drop" the temporary bank right in place. Very much a modular/pre-fab home in the US.
Just a thought, just a personal theory...all imo. Andy