Every time we do a RACHEL deployment in a school, we train the teachers. We don't charge the schools for the trainings, but we ask them to cover the cost of the Pi or RACHEL Plus and accessories, if needed. This shows us their level of interest and commitment to use it with their students, and sometimes we cover part of that cost too if the interest is high.
We also organize workshops to strengthen the use of RACHEL in the classroom. Normally we do it in one school and invite teachers from other schools in the area to participate. We could invite teachers from the school you are supporting when we have our next workshop/training in the area.