Do you know Sheriff Joe???
Are you familiar with the California Rare Fruit Growers? There is an Arizona chapter and I've gone down there a couple of times. Doug Jones has a lot of bananas at his place on the south side of Phoenix (I think, hard to keep track of where I was at when riding in the back seat of a car) and Tall Namwah has proven to be his favorite after many years of growing. Many of his bananas are in a huge greenhouse but he and some of the others there did also grow them outside just fine. Good luck!