Obs Cop,
You have hit the nail on the head.......a PPL holder with a Microlight Instructor rating can be paid for instruction.
If all a person want to do is teach and fly then 3 axis microlight instruction is the same as SEP instruction for the PPL........just as rewarding and just as much fun.
So that is why I say that there absolutely no need to feel sorry for people who by choice exclude themselves from something that they claim to want to do.
Regards,
DFC