We do occasionally see kids coming through who have had damage done to the frontal lobe region of the brain who have many overlapping symptoms with Asperger's. You're probably doing a lot of that already but my advice would be to borrow from that camp whatever works instead of reinventing the wheel. You're probably already familiar with Nonverbal Learning Disability but if you aren't I'll give a link for that as you may find some help there as well. (NLD kids have loads of problems with personal space and coordination).
We always have to drill parents on diagnosis, services, and school setting because any one thing out of order there can really throw a kid out of whack and make a tremendous improvement when addressed properly. If everything you have ever tried to bring about behaviorally hasn't made any forward progress I'd personally toss it all and start over again using The Explosive Child strategy. The idea here is to focus so totally on prevention and reducing meltdowns so that the child leaves behind the knee jerk reaction to authority that they have been accustomed to for so long. When my difficult child was unstable due to anxiety and a bad medication reaction we used this method to the extreme for a time, ignoring EVERYTHNG but safety concerns. It took constant supervision and a lot of tongue biting but eventually we had success (in our case also adding in behavior mod but I would start with The Explosive Child first). Some kids do well enough with this change in strategy to avoid medications, so in my opinion it's worth giving it a good trial.
I've got a handout on disciplining a child with Executive Function problems that I'll post for you as well.
