No schools as of yet. But I do know of a pilot that has been flying into kingman in a twin piston engine to meet his student recently. I don't know exactly what kind of training he offers but I do know he is a private instructor and flight school.
There are no schools that I know of however there are a few individuals who may offer hours training. Your best bet would be to talk to the airport authority in Kingman and ask if there are any qualified trainers in the area.
Thanks! Your answer is awaiting moderation.