Exactly, the infrastructure is already there in the flying schools, all CASA have to do is define the RPL requirements, restore delegate status to the
responsible schools and you're away.
Mind you that was being seriously abused by some in the past.
Spot checks as in the past and Bruce is your uncle.
There is IMHO no direct role for any of the alphabet soup orgs other than advocacy and a watching brief.
The first time I ever met a DCA dude was in 1966 when we started commercial operations, we knew what the rules were and even helped invent more than a few, they then let us get on with it.
And every body was surveilled equally, even to the point of auditing every flight plan for flight time, weights and fuel. It was the price we were happy to accept, to keep the dodgy bros under pressure.
The clients learnt pretty early on to ask the operator for the results of a ramp check and who was pushing the boundaries and not. They voted with their feet, and that is the way it should be.