What shortage of instructors would that be then???
There has been talk of the NPPL coming for some time now, but who knows when. It has been suggested that when this comes there ‘may’ be some sort of National restricted FI rating for NPPL only. At the current speed of bureaucracy, that will be at least a couple of years away.
The current situation is, that to become an FI, you must be able to demonstrate a theory knowledge at CPL level. That in short means that you must sit the ATPL exams, as there are no CPL ground school courses or exams available at the moment.
Then, if you wish to be paid, (and I use the term loosely) you must have a CPL.
Things may change, but not for some time I suspect.
CP