Nice concept. I get the direction you are going. I think the chiclet style keys are cool looking in the drawing but I think a more functional item would be a cap sense or resistive touch E-ink screen. With the E-ink you could have a much more functional space to work with. Instead of having the user memorize what they left where you can visually represent what is where the monotone color might be a handicap but it's a heck of a lot more functional than standard keys. It also cleans up a lot better if you are snacking while you work. Finally it'll give you a thinner profile.
I work in electronics design and production. Send me a PM if you want to talk more.