In many places I know of, it is as simple as a parent writing a letter claiming to be opposed to vaccination on philosophical and/or religious grounds.
My parents were very anti-vaccination and are part of a 'religion' that exempts us from it... all we needed was a note from a 'religious leader' and its done... I'm not vaccinated for anything. The religion is 'The Universal Congregation of Wisdom' (its very chiropractic, my dads a chiropractor... the 'religious doctrine' is pretty entertaining...)
you can join with a letter and like a 200$ donation or soemthing