Make passing the survival/first aid course a requirement for remaining/advancing in the troop. If you can.

If not: try making it a requirement for participation in any of the active activities. After all the scout might have to render aid to a fellow member.

Part of me, the nasty part is considering various (perfectly legitimate) ways to encourage the touchy feely parent to take themselves and their offspring someplace else. The rest of me is saying that wouldn't be fair on the kids.