That was a nice and informative post. Good to know there are nice police out there, including ones into the same hobby.
But I always tell people- buy an obvious mirror and headlight at least. Even if it's a basic motor-on-bicycle build it is still a moped mechanically, and sounds like one too. If I were a cop and saw someone riding a motor vehicle without a light attached I would probably pull them over. Next buy a tailight and speedo so you don't go over the limit.