I believe that his Broad Reading and Total scores qualify for DYS. If you can get together info for a portfolio or manage to get IQ testing done, I would consider applying to see if they could help you out with advocacy.
I'm really, really skeptical about state law being such that you they cannot consider any acceleration for him before age six. I'd ask the GT coordinator about that specifically and ask for a copy of the state law. Subject acceleration seems like a reasonable accommodation to seek at least.
