I don't have one, so I would't know, but wouldn't an Entourage eDGe (full size) from eBay fit the bill? You will be hard pressed to find any stylus-enabled tablets, since almost everyone has jumped on the capacitive touchscreen bandwagon. The full size EE should give him plenty of space.
Like I said, I don't have one, but maybe one of the EE owners can say if it'd be a good idea.
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