What if you were to play around with the frets with your right hand and mod the controller out to replace the strum bar with two foot pedals? (A bit of a roundabout solution, but Its better than the other replies you've gotten...)
What I'd really like to see is the content of these letters that he's sent to Sony. Theres another article linked inside of this one about a guy who is blind and helps other blind people play commercial games through screen readers, surround sound, and menu guides. He's even gone so far as to send mail to developers and publishers to suggest how they might better help the blind.
That could be the key difference between these two. If this guy just sent a bunch of letters about how "OMGZ UR GAME ISH HARD FUR BLIND PEEPS" and then giggled to himself how they didn't respond to him, then he's just being an idiot trying to get some cash out of this. If Sony's been ignoring valid suggestions on how to help and giving him the silent treatment, then he might have a case.