I guess I am looking for advice on how to help him become a successful self-advocate and not an excuse making whiner who thinks he can get out of doing something he doesn't WANT to do because of his disabilities.
Sorry to be so long-winded on this, KJP, but another thought occurred to me - when we're dealing with huge things like unravelling our children's learning challenges, sometimes we need to just step back a bit and realize, hey part of this behavior may simply be his age, and I can deal with it that way. Explain to him whining doesn't work, ask him questions about how he's feeling etc.
The cause for his behavior may be a learning challenge, but the way the behavior plays out and how to deal with it are what you'd do with any nt child acting that way.
pbear