This is an area I'm also massively interested in and have spent the last 10+ years working with, ceremonially and study-wise.

I'm curious as to how you came to the conclusion that what these symbols represent is "far beyond archetypes". Surely if there were a phenomenological experience - since all experience occurs through the sense doors - so consistent that it can be expressed in similar symbols by various cultures, that in itself would be archetypal? Do you mean it's far beyond Jungian archetypes?

What about the possibility that these patterns of information exist within the human nervous system and can be triggered through various methods? What about the possibility that these symbolic representations are simply anthropomorphizations of internal processes which can't be translated in other ways by the human brain?

There are considerably more than two essential possibilities when it come to the similarities between multiple symbolic models of reality.