I am doing this! I am only doing one-off workshops and a co-op club which does not always come to my place, but there is so much potential. Have you heard of
forest schools?
Giving kids a place to experiment, play and build outdoors is, in my opinion, a key part of infecting brains with permaculture. When kids see moving water they begin to think about hydrology. When they begin to see the difference between leaves that taste yummy, leaves that taste bitter and leaves that are poisonous, they learn quickly and teach their parents. "Observe and interact" is the natural way of children, we only need to get them outside and they begin.
Giving children a place to experience the outdoors is really good work.
I don't think you need to hire permaculture experts to teach permaculture gardening techniques to young children to be successful. You can hire good open minded teachers to facilitate children's experiences of the outdoors on a permaculture property, teaching the teachers about the permaculture principles.
Have you seen Matt Powers'
"the permaculture student" curriculum?
You might find some folks through your local waldorf school, they might even be interested in some kind of partnership.