if i know our school system at all, i doubt you will get more money

start looking for something else while carrying on working tell the head of your plans he might not want to loose you so might offer you something else

again it depends on your head as goverment dont give them enough to keep up with costs so money gets saved where ever

you could look at a special school there are two in my area one for the older students that could cope with a sort of normal school life that aslso has borders as its the only one for a distance and also one that takes younger disabled children

good luck