As far as I understand, they are not allied with the space monsters or precursor sentinels. Therefore I believe the event is reasonable but the flavor text should be changed. If it really was the pirates, they could have their own event and A: bribe them to leave you alone B: lie (small - to relations) C: scoff (larger - to relations).
They pretty much need to sweep through all of the possible events to alter or eliminate those that don't make sense for the faction. Over the weekend the Onyx were trading away their promethion. 
If it were me, I'd have a large spreadsheet. It would probably take a solid day to work through all of the combinations and decide on desired effects and who knows how long to implement it all.
