They would need a new XL ship to be a base where the scavengers deposit the wrecks and salvage. Foragers would instead of being fighters, a new S salvage ship that swarm wrecks enmasse and quickly take the salvage to the base ship. New L and M combat ships would jump with this fleet to assist the S and M fighters. Corvette: 'Warrior'. Destroyer: 'Executor'.
And as I said before these raids could be limited to the target system so they dont spread, and there could be plenty of warning in the form of a large and visually impressive anomaly and universe wide bulletins (missions too like x3 invasions). Perhaps this anomaly could push ships away instead of sucking them in like the current ones so defenders cant get too close to it before the fleet appears. Sometimes however perhaps the anomaly would appear far off of sector centers, and bulletins only happen if someone actually spots it?
Anyway, exciting stuff I think
I dont think anyone in this thread suggested spawning destroyers ontop of miners? Adding capitals doesnt automatically mean they will do the same things the S and M ships do right now.