Dang, why do the interesting/fun questions get asked while my story's just begun? (Not being mean, it's just a funny coincidence)
I technically do have a plan for my own "multiverse", but I would have to publish a few other comic series before I give it any more thought. It's very "high concept" and even absurd, given the lengths I'd have to go just to "connect" everything, but "absurd" kinda would fit into many series that I would eventually publish, even if some were more "serious" in theme.
I plan to connect them all (subjectively) with one man with some secretive otherworldy bulls--t. And yes, he technically appears in Friar Chicken, of all places, briefly, and hopefully he'll be spotted in the background of other series-to-be. It's still WAY too early to reveal anything more, but given plenty of time, and perhaps a miracle, even I'd be curious to see how my own "verse" plays out.
(I've never heard of the omniverse concept, but personally if someone saw my hashed story as worthy of taking place in theirs/another's universe then that would make my creator life!)