There's a difference. Assassins are a elite group of killers. The Bounty Hunters are trained mercs. One lives in secrecy. One doesn't. Etc, etc. Besides, I don't think that faction is active anyways.
Instead of trying to bring back the group to organize the bounty hunters and organize their targets, why not post Bingo Books?
(because this isn't Naruto :P)
That's sort of like what I suggested to J Mocks via PM. I think it would be better if there was a bounty system in place rather than a faction, since those consistently fail.
And then there could just be a character or characters that handle bounties and whatnot. Rewards, punishments for failure, briefings, etc.
In canon, the GenoHaradan have existed since around 25,000 BBY or so if I remember correctly.
CARD is more like an Umbrella Corporation in my eyes and the BHG has been and will most likely continue to be dead, though I would love to try and organize a way to hunt criminal characters.