That idea is interesting, but my opinion of it is based on whether or not roles are revealed on death (read: are they?) . . . If not, then we get all sorts of interesting sitchyations with whether or not for the Forges to kill the KD due to the double-death of the KD and the Sweetheart possibly revealing the KD. This all presumes that you decide not to end the game on a night-kill of the KD, of course . . . Pretty please?
It'd certainly make sense story-wise for the role not to be revealed, since nothing (nothing yet revealed, anyway) physically differentiates a Forger, a KD, or a Sweetheart from your average dwarf, unlike in a game of WW with actual werewolves/ducks/wotsits.
EDIT: Scratch that - I just looked back at the story and saw the part about "the society's brand."