You can find paths that lead from our universe to those other universes in a rotating black hole but it is not so clear you can survive the trip. The inner event horizon and the "ring singularity" inside the Kerr solution are believed to be unstable classically and thus not really there. (Personally I think the classical black hole is probably entirely wrong on the other side of the event horizon.)
Andrei Linde wrote a paper on "chaotic inflation" that suggested the inflation process is driven by topological defects that have a very high energy density such as magnetic monopoles, cosmic strings, and domain walls. Inflation is ignited by the presence of such things and the result is that you don't see any in our universe, if you are lucky you might find some evidence that one of those is near our universe that is imprinted in the cosmic microwave background.
One could imagine that in the violent processes inside a black hole that inflation would activate and create the space for a new universe or universes. I'd imagine you'd have to go through that inflating region to get there and I think that would be both impossible and deadly.
That joins many insinuations that there are surfaces around black holes (e.g. "firewalls") that will kill you if the spaghettification doesn't.
If you think black holes spawn new universes you might imagine our own universe was "naturally selected" to produce lots of big start that make black holes, which is an interesting twist on anthropic arguments.