I do not want to piss on the parade here, but is the whole idea of the Lightning Network not to have a 100% digital payment network? we will go backwards, if we start the physical printing of "money" again.
The whole idea of Bitcoin, was to replace the old way of physically printing money and now people want to go back to that again? Nope, I think you must go back to the drawing board with your idea and eliminate the "printing" idea.
