It can be easily done already, you should just learn how to do it right.
All I see in your original idea is result of some massive butthurt from the fact that you can't solo-mine and not get blown up to pieces by any random pirate. That's not how one mines properly.
I've had a good chunk of my total income in disco from mining, and I've been in each and every mining spot with each and every ID possible, and I never felt the need for anything better than a Hegemon for mining... Why? Because I always had a scout by my side, and I never got pirated except once or twice.
Giving powerminers something with gunboat firepower will only kill group mining even more. Because... Why should someone even bother talking to an escort/scout if they're in a Cap8 Miner-Gunboat-Thing?
So that's a 'No' from me. If you want to force pirates to teamwork, do it yourself. 2 GBs & a PT running from 2 Mafics and a Dacite is a fun thing to watch, but that rarely happens... Go figure why!
