I've glanced through the roles and it seems there's no 100% way to confirm someone as civilian, unless we have Opal confirm someone. Of course, there's also the risk that the mafia would be pretending to be Opal, which could be resolved only if either Opal dies (bad) or Opal roleclaims with no counterclaim (also bad.)
And if we give all the roles to mafia by accident, we almost certainly lose.
Now, we could RNG a name and use that, which would have a 80% chance to give us a small advantage and a 20% chance to ruin us. I'd rather pass on that.