And maybe add an unshielded old version Kol to their high-level fleets, like someone suggested way back when.
Yah, give the fleet another cap ship for every 5000 creds of bounty...They should get derelict Advent and Vasari ships too, since Pirates are equal-opportunity scallywags...
You know what would make pirates relevant in multiplayer? The ability to put bounty on specific player planets. At this point pirate-proofing can be as simple as running a scout all around the grav well or just scuttling your orbitals. You don't really need anything else unless they brought siege.
But if you could bounty a given planet, say for twice the amount of normal bounty, then it would suddenly be worthwhile to use pirates as a distraction, harrassment, or coup-de-grace