The current situation really makes no sense.
I have a long-held ambition to teach ab-initio boys and girls how to fly a Cub from a grass strip and to also teach basic aerobatics.
Albeit only a humble PPL, I believe that my experience, in excess of 500 hours in sexy sports biplanes and 200 hours in vintage taildraggers would make me better qualified than a youth with a frozen ATPL and the same hour in a 152 two hundred times.
So why don't I do it?
Well an FIC costs circa £6k fully funded.
My ambition is genuine but not fully altruistic, so I'd need a CPL to start recovering costs - 9 months of study and a further £6k.
Twelve grand to pursue an ambition, not exactly a huge amount of money but I'm sure that I'd derive more enjoyment from pursuing a different ambition, learning to fly a helicopter!
You can do the CRI course.
Core course (1 week) and 5 hours flight training. Allows you to do differences training and the bi-annual training flight.
Can not be paid to do this instruction but capital outlay a fraction of the figures you quote.