How about launching the strike craft from a deployed Mine-Dispenser.
When you destroy the Mine Dispenser, you will have broken the link to the strikecraft, and if you set their hull degredation to Zero, they will stay permanently.
Also, The Mine Dispenser has an ability that multiplies the top speed of the mine by about fifty, so that when the Mine Dispenser self-destructs, you get a field of slow Drift Mines (I like drift mines)
Also, the drift mines have an ability that makes them drift 2-3-5 times as fast, the closer they are to an enemy ship, which solves any problem of them bunching together too much before they get to their targets, Oh, and make the drift mines "preferstofocusfire=false" this is important...
Also, the mines have an ability to do 3-4 levels of damage, depending on how close something is, but is only activated when an enemy is inside the closest setting, this way, the maximum damage is alwasy done, but everyone else in the vicinity takes less damage depending on how close they get...
This should get very close to what you want, if you like Proximity Drift Mines...