Any attempt to regulate the use of micro-inverters is bound to be as successful as attempts to prevent home brewing have been.
Installing a micro-inverter is so easy, it can be done in minutes, by most anyone, without interrupting household supply. The only question is whether the meter will run backwards or not.
Separate meters? Simply not possible, when the micro-inverter ties directly to a breaker in the common panel. There is NO separate panel needed for them. The breaker is all the disconnect you need.
Permits? Might as well require them for replacing a light switch.
Impede the use of micro inverters, and you're taking away the biggest incentive to having solar at all. Until their advent, solar installations were a nightmare of major electrical work. With them, adding solar is as easy as adding a porch light.
Now, there might be a world where legions of agents slink around, peeking into yards and neighbors are expected to inform on each other .... ever notice that EVERY place that has tried that approach has collapsed, a complete social failure? In what universe is imitating failure a sensible solution?
