Gordian Knot of a problem...
...and I'm having trouble of thinking of a sword sharp enough.
Okay... repair bays/ regeneration bays. Get three in a cluster, and park a mid-sized fleet of LRMs/Assailants in the middle. Toss in a few Gauss/Missile Batteries to taste. Doesn't even need a capship to work- the capship can be elsewhere, creeping or putting out fires.
I cannot for the life of me think of an early-game way to break this. Vasari get this at Miltech 1; TEC gets it at Miltec 2, but also gets a pair of useful Repair Bay upgrades at that level.
This is a relatively early-game strat to secure a choke system. How- in early-game terms, mind you- would you crack it?