There is no law that you have to hire teachers in any language other than english. Many districts will try to hire bi- or more lingual teachers. Spanish usually gets better treatment than other languages for the simple reason that there are plenty of spanish speakers in the schools and its not hard to find spanish speaking teahers. Other languages not as easy. Pashtun (from Afganistan) they cannot find teachers who speak that language (NYC was looking for such teachers)
If East Ramapo wanted to hire Yiddish speaking teachers because they felt they needed them, then let them do so. They would hire them as a need, not as a requirement. And it would be cheaper than sending them to Kiryat Joel.
And while the law does not care what religon you are , and saying that you dont want you children to sing songs about a fat man with in a red suit in december. Do you really think many non-jews would attend a special ed class in Monsey. You can put the classes there