I wonder if you could get some other coaches involved first....watch videos, read material, then when you're ready, present it to large groups, even if you have to combine schools. Smaller groups are awkward, and teachers are the most challenging students of all! Advertise it as a "Teaching Challenging Students" workshop, and send them to the website, too, to check it out and see the interest.
Whatever you do, try to keep the groups large...that way the energy is high and obvious, and people feel less self-conscious. You may want to show them some of Biff's videos as part of your presentation, as well.