Your idea is fantastic. Please be careful of individuals who have the look of money twinkling in their eyes. Its also the same look as greed.

On another note I found this (words plus) product which uses the same idea as yours. This is the way that Stephen W. Hawking communicates to the masses. Overcoming some of the limitations that ALS has given him.

Given the choice, I'd be using your product.

BMaximus