I'll change the infocard to Allies: None, like in Vanilla. That will give you more freedom in forming alliances.
However note that there's hardly a place for Unioners in the Corsair coalition, cause they have good relations with Liberty Rogues and Bundschuh. They reside in one system with a LR base, and are patrol paths between bases of two factions. Also, according to Vanilla empathy stats, they are friends with Rogues and most of the Rheinland pirates.
