No, that's not my plan. Maybe I'm not explaining this well.
Multiple cloaked wraiths appear. In one, a queen. In the others, ground force of Zerg.
The wraiths proceed to destroy the docked shipsm, and comm equipment. So none of the pirates are calling for help, and none of them are escaping.
To everyone watching, this looks like delicious pirate on pirate action.
Now, the wraiths dock to the station, and the ground force invades. They kill some, and fleshlings and cockalisks hold down the rest and infest them. This has worked before, in the thread right after the Disruptor came on.
Now that the ground forces have infected and pacified the enemy, they get back on their cloaked Wraiths, and leave. The one queen sneaks onboard the station, and pumps out spores through the vents (after the scrubbers have been disabled if that's a huge deal for you). The queen stays there permanently. Now everyone who visits the station gets infected.
The last wraith leaves. To everyone watching, the raid is over. All the infested Terrans inside rig the evidence to look like a Terran on Terran conflict. We delete all tapes of Zerg, remove all evidence of Zerg. We watch as pirates flying to all kinds of outlying systems spread the infestion.
I didn't realize I was going to have to spell this out step by step, I thought it could be followed pretty logically.