If the real block is computer access (and that's not just an excuse), could you offer to put a laptop in his classroom for the rest of the year? We've done this (for accommodations, mind you) for years until the school caught up and provided one.
These days, a refurbished laptop can be had incredibly cheaply - under $200 even here up North with the brutal exchange rate.
That's a good idea to have in my back pocket... and I even have a spare laptop. I'm thinking it's more of an excuse, though. They have tablets for an entire class, but they share between two classes. They don't use them all day long, just at specific intervals. I'm wondering if it's more because they don't want to give him "special" treatment, even though I feel it would actually benefit everyone. I think the main issue will be convincing them that he needs the challenge (and then finding a way to provide it).