If you'll allow a non instructor, non highly experienced PPL a word ...
I'd guess your chances of getting work as a CRI are directly proportional to both what you have to offer and what is required. As a CRI with little more experience than a fresh FIR you won't be particularly employable. If however, you are a well placed competition aeros pilot, have thousands of hours, an IR, ME or whatever experience a particular school needs ... you'll be snapped up

When I say employed, I mean of course, used/allowed to help out

To earn you will of course need a CPL, accept maybe for ground exams if you're allowed to teach them???
I'm tempted as it does seem a great qualification for the cost and may be of use to hit the ground running if an NPPL SEP instructor rating does come along. I doubt I'll ever have the spare cash to get the CPL's and FIR as things stand

I personally don't think I'm ready just yet from a currency point of view, but by the end of the year that will be different now I'm getting a lot more flying in
As far as the rest of this thread goes .... hmmmmm

It's the same old arguments yet again so maybe I'll keep

other than to say PPL instructors seemed to do a reasonable job back when I learned ... or maybe they didn't?
SS