If there was an unguarded jump hole, the Smuggler-evading-detection thing would work... However, there should be a battleship stationed at the New York Jump Gate (Player) to just blast everyone on sight. Better still, make the lower parts of the system the LSF guard system, so you have proper LSF bases and rules to destroy unauthorised contacts.
Personally, I don't think the Corsairs have any business in Liberty, other than escorting smugglers. They aren't friendly with anyone in the area, the closest group would be the Junkers. They probably don't have the resources to attack Liberty, without severely opening up their home defences for Hessian/Outcast attack.
Escorting a smuggler seems to be sort of contradictory to the whole "sneaking" thing... But that's my opinion.