For the PPL writtens no qualification is required. In theory a non pilot could give ground school. In reality the majority of students get by with self study, with perhaps a little one to one with an instructor if they have a problem area. Those that struggle with self discipline go to one of the "all done in one week" specialist centres. Each flying club/school will have their own system for compliance.
If you really have no wish to go to the airlines please send me a PM.