The immediate problem I see is the cop being scum. The second problem is you being scum and setting up so that cop gets scum. There are many things that can go wrong if scum get the right roles. So yeah.
Good thing I'm TOWNIE OBVTOWN so you don't need to worry. This reminds me of Mafia Rules Mafia actually, when I came up with a plan for night actions that would have won us the game, and Iced Fairy got out of it (that night anyways) by going PARANOIA and everyone doing their own thing. Huh what's plan is good. Huh what's plan is great. FOLLOW HUH WHAT JESUS TO THE PROMISED LAND.
Currently not at home, so I'll chip in later. I was going to suggest a plan similar to what HW's trying to do but now I'm mostly worried if this game will become stratego-B. I mean, yeah, we can game the scum this way, but I'm pretty sure it can go the other way around as well. I'm thinking just select roles naturally + play the game naturally + catch the scum naturally like it were a normal game.
Though, again, I haven't read any of this in-depth. This is just a note.
you can catch the scum naturally after you take your role, soldier. The scum will be the ones caught trying to cheat.