Hal, I'm way out of my depth, but if I'm correctly interpreting what you are saying, it looks to me that your multiverse model cannot be valid.
This is because it answers the question "Why does anything exist?" with the answer "Because it's not possible to conceive of Nothing, since the concept of Nothing is Something." However, this answer requires Something that conceptualizes. Suppose that Something is not there? If there were Nothing, there could be no Something. Norman