I teach in an Auckland school and have a diagnosed Aspergers child in my class (he is a joy to teach!). As far as support goes, he gets teacher aid support for one hour, two days a week - other than that he is fully functioning in the mainstream classroom. Our school is highly multicultural (this little boy is indian) and many of our special needs students have immigrated to NZ from other places, so it would appear that immigration processes are not strictly restrictive. Hope this helps!
Amy.