Each townie is randomly given a number from 1 to 7 (or these numbers can be replaced with characters from some flavor source, hence the name, the only rule is that the 7 possibilities must be public). All townies are guaranteed to have different numbers. Two numbers are not given, but the scum aren't given any information about what they are. Players flip with their numbers.
Other than that, game plays out normally with lynches and nightkills.
I feel like this may be somewhat close to balanced but I haven't done the EV calculation. A reasonable assumption for EV is that there will be a D1 massclaim in a random order.