RiSq
I understand where you are coming from. However, to anyone determined enough none of the suggestions you make will prevent unscrupulous shops selling drones to anyone they feel like - whether or not the customer has any form of formal licence or qualification.
If some people are happy to drive a car without insurance or tax then what makes you think that their counterparts in the drone world won't do exactly the same?
Re your reference to the M4, last time I looked I didn't see any 747's driving down the outside lane !!