Being 3 dimensional can really suck sometimes. It makes it difficult to conceive of the 'outer' edge of the universe actually being the 'center', which, if I'm grasping your thesis correctly, is why the matter, spacetime, and assorted urges, are therefore recycled, creating the eternal flow.
You well state that neither time nor space exist each without the other. I would add to that gravity, which isn't a force like matter, the electroweak, etc., but is how those affect spacetime. Gravity is simply how spacetime is distorted by forces within it, and that distortion doesn't propagate across spacetime, like a ripple in a pond, but is more like the shape of the pond itself, as constrained by the lake bed.
When the ground changes shape, the pond is a new shape. It doesn't gradually change shape. So, gravity takes no time to span space, and extends to the limits of space and time. This links all force in the universe in real time (rather urTime, or all times, past and present) throughout the entire extent of space.
While we can't yet know what's going to happen tomorrow, this information exists in the distortion of spacetime that gravity is. I find this intriguing, and wonder if there's ways we can discern this information.
Have you read 'A Brief History of Time' by Stephen Hawking? In it he shows how not only matter/force, but spacetime itself is continually created throughout the universe. This boggles my mind a bit, because it would seem that gravity necessarily is also, and thus the total information in the universe. Sorta like adding 1 to infinity.
However, that provides a caveat to both the Big Bang theory, and your own proposal, as neither reckon on new spacetime exerting itself into the extant universe. I reckon creation is ongoing.
My worst problem with the Big Bang theory is inflation, where they posit that expansion in the early universe exceeded the speed of light. I don't buy it.
Thanks!