Makes sense that the Cheesesteak would be a popular export. Its origins are Italian, and like other Italian foods you can make it anywhere if you get the prep and the ingredients right. It's also heavily customizable and can last a while like pizza.
IMO getting the bread right is the hard part, but I imagine a good chef will recognize that quickly. Philly has special bakeries that supply a lot of the steak places (Amorosos, etc).
Also I'm sorry but cheese wiz is disgusting. Get Provolone :).