It depends on the institute's policy. Even if it's not a textbook, they still have to spend money and this is kind of educational materials. Maybe you should insist on raising a question on the institute's council and conducting a survey. Carefully explain the purpose of implementation of your product and collect the teachers' and parents' opinion. There could be and other solutions, I really think that if you want to sell them your product you should examine every situation and spend more time for direct communication with dept. heads.
This is an eLearning
platform or product, right?