The following setup is something I worked on with help from @eevee:
Town Role Cop
Town JOAT (1x alignment check, 1x jail, 1x kill)
Town Citizen x12
Mafia JOAT (1x rolecop, 1x jail, 1x kill)
Mafia Goon x2
The Town Role Cop learns only the role of the target, not alignment. Thus, the Town and Mafia versions of each PR are indistinguishable.
Because it's targeted at newbies, we also decided to have the RC get Goon/Citizen instead of Vanilla for both.
I think this setup works well at accomplishing its goals of introducing new players to
more advanced but still standard roles, the ideas of counterclaims, and how larger games will play out. However, I'm wondering what you all think of it.