Hi mike2edad,
He sounds like a wonderful kid.
My 2e is younger (age 9) but here are the useful things I've found so far:
For negotiating with school:
--bring esteemed outside professionals to the meetings to explain precisely how the disabilities are affecting him.
--bring a professional educational advocate to negotiate for you, or
--get formal legal representation from your state's legal rights service (called different things in different places)
But I think you also need to work on the "won't do meaningless assignments" part. For this, I would use CBT (cognitive-behavior therapy). Part of holding any job is accepting that sometimes you truly have to do what you're told, even if you don't see the point. For a gifted person with AS, this is very hard-- if they don't see a point in it, they don't do it. If they are to become employable, they need to learn the mature perspective-taking that shows them when to do tasks that OTHERS think are important.
You should not settle for boilerplate-- the plan should be individual-- but neither should you work around his difficulties without also working on them. That will get you the best results over the long term, IMO.
DeeDee