I think this is a project created for me.... We are a team of electronics engineers with great experience in designing and developing bluetooth based systems to communicate to smartphones. We have done many similar projects. I can send you videos of our bluetooth based designs.. and regarding your requirement, i think a pressure based touch panel with some electronics circuit will make a thin sensor that can fit below the notepad to capure the impressions. We have done one project with pressure based resistive touch panel. Please let me know your views on it..
And regarding our services on this;
We can provide end to end design support from concept development to the manufacturing support.. we make prototypes, test cases etc also.
I assure you the best quality service for your requirement.
Please ask me if you have any questions or concerns
Also check my previous project history and reviews.
Thank you
Joby