It sounds like your philosophy and ideas are a perfect fit for Montessori. I don't know about the program near you, but here the AMS 6-9 and 9-12 programs span over three summers, with one or two three-day institutes throughout the year.
If you are hired by this Montessori school, will they pay for your training? A lot of schools will do that for their teachers. It's worth checking into if you don't know already.
edit: Pickles pretty much said the same thing already!