I shot the WB for years with my compound, but never with fingers. It may work, but I never felt comfortable, knowing what fingers do to the arrow at release.

I always shoot my traditional bows off the shelf, but have used a flipper in the past and they work very well. Shooting anything without a plunger or a windage adjustment, will make spine far more critical. You can shoot perfectly off the shelf or with the most simple flipper, but you need to know how to spine tune. It is critical in those situations where you can't make left/right adjustments.