Have you ever thought about making like a universal tablet dock for iOS and Android phones with your innovation? So the tablet would be just a touchscreen, battery and your module with a cavity to hold the phone. Basically, the concept would turn any phone into a tablet.
I heard about this type of concept that I think Motorolla was developing and thought..."That makes more sense that having a separate tablet".
Something generic that fits an all in one solution would have a greater demand and help you fund your R&D efforts than being restricted to the Car PC community for now.
Just an idea