Found an interesing concept! Smartians by Frolic studio. As someone with a big technology interest, but also an sustainability awareness, this appeals tremendously.
I wonder what protocol they would use, and if this could be done by oneself quite easilly. I happen to have a lot of little motors lying around controllerboard, battery and motor. Write the code, integrate with the heart. Design and 3D-print holder and case. Don’t want another hub, charging would probably work with cable only. Probably easier to just buy the product, when or if its released!