I was thinking, and I kinda agree with Fang on the megaversal and omniversal stuff being weird. How about we just switch to multiverse types? One through four.
1. Infinitely sized universes that have infinite copies of the observable due to actually being infinite in size.
2. More than one of those.
3. An infinite number of those.
4. An infinite number of those but also universes that run on completely different constants and variables. Kitchen sink multiverses where every universe you can think of exists in some way or form.