There are two resources I'll recommend that might interest you. One is the classic
DMT: The Spirit Molecule by Rick Strassman in which he explicitly theorizes that DMT could play a pivotal role in both the mother and child's brains during vaginal childbirth. He goes on to theorize about how C-section births could reduce or even eliminate the DMT release during birth which leads to problems later in life.
The second resource would be reading
Prometheus Rising by Robert Anton Wilson. While both this book and
The Spirit Molecule should really be required reading for everyone here, I am just recommending individual parts of both texts which could be of interest to you. Anyway Wilson's 6th circuit of psychology (which is Leary's 7th) is the collective neurogenetic circuit which gives humans experiences of being back in time, at or even before our births. With these kinds of experiences we can even view the collective knowledge of our species according to Wilson.
DMT and various other psychedelics are known activators of many of the circuits, especially higher ones such as this. Strassman even suggests, as you seem to as well, that the DMT experience could be an allusion or even a replay to our births. But also I think it would be important to consider that maybe hyperspace or whatever elements we like to discuss exist independently of our perception, and they can only be perceived by such an early human who has not been exposed so much to sensation yet or a human under the influence of an extraordinarily powerful psychedelic drug such as DMT.
So instead of being a "replay" of birth the DMT experience could act as something that breaks down barriers that social and sensual conventions have built up in our minds with years of living in society. Excitingly, this may be the realm to which we travel upon death or an exit from our bodies.
While this all may seem very exciting and even plausible to an extent, we do have to keep in mind that these are all just theories and models. You have to determine for yourself how realistic they are and how applicable they are to improving your life or whatever other goals you have set for yourself.
"Think for yourself and question authority." - Leary
"To step out of ideology - it hurts. It's a painful experience. You must force yourself to do it." - Žižek