You will be informed only if you try.

All business is really circle: begin -> try to make -> try to sell -> measure income -> decide if possible to continue (or if worth) -> if decide, return to begin.

Nobody could tell you if it worth, without try. To be strict, exist people, who know everything, like taxi drivers, but for some fundamental reasons, they don't use their knowledge to earn money and got some better life.

Since nothing about the keys themselves is new(the new stuff is how I would use the control surfaces), I should start making a prototype by ripping out the keys from some existing keyboard:)

Ok, it's unclear to me, what is your proposal? I should wait? Or something else? :)

For example, I could design case for 3D printing. Or develop app (possible mobile, possible desktop).