Gauging interest, I have yet to make the setup but it'll be with normal roles (and no conversion). If I get an easy 12 I'll do it this weekend.
3 mafia, 9 town
Instead of voting players out, town votes a player into the Circle of Trust twice per day. If town lets a mafia member into the Circle of Trust, mafia wins. If town forms a circle of 6 players, they win. If they cannot, mafia wins. There will be at least 2 night phases during which familiar power roles may act and mafia may make a factional kill.
Day phases are 36 hours, with one vote per 18 hours.