First, the idea isn't that universes birth new universes, really. It's more like a big enough, empty enough space allows universes to pop into existence. So there would be a sequence of first this universe, then that universe, but it isn't a causality chain between universes, really. It sort of seems that way since our universe towards the end is going to be a big enough, empty enough space that another universe is going to pop in there.
Second, why wouldn't we get an ordered sequence? If it's infinite, it would never be complete, but ordered, sure. Think about irrational numbers. They go on forever, but we can calculate what each digit is going to be for as long as we're capable of continuing to calculate things. That's an ordered sequence, it's just never complete. So what?
Yes, I'm familiar with Kalam. It doesn't try to prove that an infinite regress is impossible, it asserts that as a premise. I guess I'm asking you to explain why it's a problem. It may be very unsatisfactory if you really, really want there to be a point that everything traces back to, but I don't see any reason that has to be the case. What's paradoxical about it? Where's the contradiction where two things can't both be true?
Yes, you keep saying, "If time is more fundamental than God" but I'm asking why it would be. If time didn't create God, then why would you think it's more fundamental than Him?