I think it'll be too overpowered for triad. In effect, one ConArtist = 2-3 triads. This is even more powerful than disguiser that can kill 2 people because it leaves the original intact. Imagine a game with an interrogator or another conartist: N1: exe, convert, DH kills -> 3 townies dead, 1 extra triad -> 4 triad 6 townies. Misinformation/false accusation for random lynch D2 -> triad has majority D3. Neutral killing also makes it worse because, by chance, it's more likely he'll hit a town. Once triad has majority, it becomes easy to wipe out everyone else because they know conclusively who is on their side.

I mean, we all get frustrated. I wish stalkers did AOE damage vs mutas. However, it would probably upset everyone else... sometimes it's not about the balancing but about getting better at the game.