Good topic, nice and thourough; well described.
Mentoring is of all times and is done often and in many different areas of personal, sportive and professional life. I’ve been a mentor for a couple of teenages and I loved it.
I think it makes only sense to do this in IF. In fact, I’m sure it is used already.
But for sure, this can be better organised.
In our church we have a mentor desk, a place (person - me!) where people can go if they are interested in mentoring someone. And of course, also people go there who want to walk side-by-side with someone for a while. That works well, but often mentor relationships start spontaniously.
I think in IF mentoring can happen not just for pilots, but for ATCs as well.
Let me know if I can help with something here!