We have not previously provided flashcards to schools because this could open us to unlimited requests.
Working with external schools not under one's control is a challenge that we have had difficulty with too. Some schools readily adopt the materials while others seem to resist, possibly because it involves more teacher work than they are used to or unfamiliarity. Some government Thai schools also adhere to the Thai standard curricula and say they do not have classroom time for more academic subjects. That is to the detriment of their students. Private schools have been much more receptive than government, apparently because they see potential financial benefit of getting better results in anubaan.
We are in a stage of trying to develop support for adoption of our curricula in various settings, one of which is in resource poor schools. There is a Thai professor at CMU who plans to integrate our curricula in 18 preschools from 18 Thai provinces as a demonstration project. That project is just starting and is funded by some federal agency, I believe.