On your other point, Bruce, about experiencing SC, I don't doubt that what people experience in NDEs is a higher level of consciousness (we'll leave aside whether entheogenic experiences are similar). But is that really at the level of SC? I'll tell you what makes me somewhat sceptical about that conclusion. Let's suppose it's true that during NDEs, and presumably after we have irrevocably died, we experience SC. If we do, but nonetheless reincarnation is a fact, then why would we experience it only to reincarnate, not experience it, and strive once more to get back to it?
My suspicion is that the NDE experience and what comes after death is not the experience of ultimate SC. Rather, it's an experience of those parts of our (still limited) consciousness which we rarely access in day-to-day life. There may be a lot further to go, and we may reincarnate because it's necessary in order to go further. If that is correct, then more advanced souls would have richer NDE experiences, though admittedly it's very difficult to test that hypothesis.
All experiences I've had, and they've never been as exotic as those reported by those taking entheogens, or NDEers, have been apparently spontaneous. I don't find that I hanker after anything more spectacular. I don't see the point: but maybe that's just me.