Idea#1 - have him tell one of those social girls.. if it is news, it will travel.
Idea #2 -- what DeeDee said...
idea #3 - I remember middle school, and wanting to literally fade into the wallpaper (that's why we all wore the same thing, so we'd fade into the background). I get this, and how he would probably feel like a million eyes are watching him type away. I think it is important to make sure he knows that all the kids are feeling like everyone is watching them. I would also make sure he knows that some percent of the children in his class have some kind of challenge (ADHD, dyslexia, CAPD, etc etc etc) only their challenges aren't necessarily visible. And then I think I would say that you are confident that one day -- hopefully really soon -- he will feel comfortable enough to use his accommodation, just like other kids use their eyeglasses.
