I can see why you think that, but there’s less new material available for me than you think.
For starters, Dovah has no clue about anything South Park related past the Streaming Wars specials (so no season 26 and beyond) since he was transmigrated before that content came out.
Also, the multiverse was shown to be a thing in South Park since season 2’s “Spookyfish” and I’m already exploring that concept in my story so nothing new there.
Maybe, if this was before I started working on the Nahkriin war, I could’ve incorporated that pander crystal plot device into it to introduce the multiverse. In fact, if I were to rewrite this story, I would explore canon parallel universes much earlier then what I did originally like the earlier mentioned evil alternate universe in season 2 since the portal leading there was never shown to be closed.
I’ll probably incorporate that special into my story at some point, but it won’t play a very big part in the overall story because of those factors.