Honestly, I wouldn't be upset if they were outright removed from the game. They don't add anything meaningful that couldn't be easily replaced, items you can buy from a trader might as well be stuff you could be using QMs for, if it were added.
Alternative suggestion: Have an antag item that acts as a "black market pass" which unlocks a secret menu of choices for people with it. That way antags can still buy Syndicate Items (and perhaps even worse in the future), and we could remove it from the regular loot pool.
Alternative suggestion: Have an antag item that acts as a "black market pass" which unlocks a secret menu of choices for people with it. That way antags can still buy Syndicate Items (and perhaps even worse in the future), and we could remove it from the regular loot pool.