Don,

I'm just thinking of other ways to skin this cat. Are you able to speak at all? Some of the voice recognition software is getting pretty good these days that at least could possibly fill your typing needs to some extent.

Also, I think Steven (sp?) Hawking has been using eyeball movement detection for typing and speaking purposes. He looks at the letters he wants to type and can trigger some means of accepting the letters.

http://news.bbc.co.uk/2/hi/uk_news/england/cambridgeshire/4213082.stm

Just some thoughts.