What about taking the PL on a camp out led by the SPL. The SM gives the SPL a list of discussion topics (What do you think your role involves? What does servant leadership mean? What did last years leaders in your position do well?, etc. ) and a list of exercises and activities (gather wood for a fire without using any saws, build a fire wih a single match, cook dinner without using a stove, teach a skill that all scouts should know but that isn't a requirement, etc.). The adults join in the discussion topics after the scouts have talked it through to confirm they are on the right track or