Yeah, I think it'd be best to wrap elements of Calvin Ellis, Val Zod and Sunshine Superman all up into one character, who all have distinct flavors within the Multiverse, but any multimedia version of him would be a hybrid because he's going to be viewed as "The Black Superman" by the larger media anyway
While true, I'm just stating that there isn't much material to expand upon written in the comics. While the concept itself is very expansive, we know that the movie area likes to take a lot of cues from their comic book counterparts. So if Super Verse received a similar level of success as Spider Verse, they don't have two ongoing series to draw content from like they do with Miles Morales and Spider Gwen.
I think the Multiversity story by Morrison definitely has enough content for a movie, and he's said he's going to eventually do a follow up. On-top of all the other famous Elseworlds material to draw from.
Considering how much of Into the Spider-Verse was the creators taking older content and spinning it in a new way, I don't think having ongoing material is as much of a factor.
"Wow. You made Spider-Man sad, congratulations. I stabbed The Hulk last week"
Wolverine, Venom Annual # 1 (2018)
Nobody does it better by Jeff Loveness
"I am Thou, Thou Art I"
Persona
"Wow. You made Spider-Man sad, congratulations. I stabbed The Hulk last week"
Wolverine, Venom Annual # 1 (2018)
Nobody does it better by Jeff Loveness
"I am Thou, Thou Art I"
Persona
The follow up is key. I'm not saying the Multiversity story isn't enough content to make a movie, I'm saying it's not enough to spawn sequels if super verse was successful. So if they want to take any consideration into doing a super verse movie, they should work on making an ongoing series so that when the eventual sequels are release, they have a backbone to fall on like they prefer to do.
They are already doing their version of Spider-Verse, it's Batman Beyond.