How about special training for x number of people. Lets say for 4 weeks. It could be at home or close to home. You already have the training contacts. The group will have to pay their way, but they get the once in a lifetime chance to get special training from you. This will be a chance to give more back to the community and it means that your sabbatical expands to the group. 😀

Of course it all depends on the availability of the correct resources near your home.