I'm basically agnostic about the version of DO and so on, but I'm quite comfortable with Ven Nanananda's analysis. I honestly can't see how time-delineated or not or "reality" or not makes any difference to the instructions of any teacher I am familiar with. That's why I'm asking.
Instructions I am most familiar with make use of the Satipathana Sutta, and the obvious parts of DO that are observable in any model (contact, feeling, craving, clinging) order to see though the delusion of self, etc. Which seems to me to be what the Suttas are asking us to do.
The things you are concerned about are, to me, things that will, one hopes, become clear as one progresses on the path. Such analysis is interesting, but I don't expect to be able to work out what nibbana is like by analysis. You seem to me to have a particular view on how the path will unfold. I'm comfortable with the idea that I have little idea of exactly how it will unfold.