Perhaps there may be yet another thing to consider: how about to make Slaver ID attractive enough so significantly more people would be playing it? At the moment, afaict, Slaver ID is rather... relatively unrewarding. Which, imho, shouldn't be, because for mostly all sorts of "unrewarding" activities it is "good" fellows who take it; "evil" characters should be centered about "gain", "profit", "power", and such staff. As i see it in ideal case, slavers are to be evil and hated by many, yet their affairs are to be very, very profitable (even after deducting losses from law enforces, etc), and/or Slavers should have access to some seriously painful tech, and/or slavers would be unique and only providers of some specific service to unlawfuls, etc.
Do you see the groundhog there? No? Me neither. But, it's there nonetheless.