At Kapcon 05 there was a 12 player game called ‘The Life’, which had a lot of LARP elements to it. It was fundamentally a Heist game with six players as the robbers and six as the cops. One of the main scenes was the bank heist itself, which the cops played the npc’s and had a pregnant women in it.
Was done very well, but the whole game extended over the planning, heist, getaway, track em down, rather than just the heist itself. If you want to focus just on the hiest and have all the players together in a small confined environment, you’d need to play up the whole psychological control aspect.
I like the idea of the subway game myself, especially if you could actaully get permission to hold it at the abandoned station in parnell on a discarded rail car.