A few things I wanna ask before I eventually do the "Non-MCU Marvel Live-Action Timelines" thread... would you consider the Marvel Cinematic Multiverse more of a Megaverse? (Basically, a multiverse within a multiverse.)
Question 2: Would you consider the MCU multiverse to almost entirely consist of live-action-based continuities?
I think contextually with the first two questions, Loki and No Way Home sorta set up that this MCU/Earth-199999 branch is still connected to the larger "Multiverse" but it's VERY isolated thanks to (the former?) Nathaniel Richards aka He Who Remains of that Earth. No Way Home's ending even involved a lot of comic-accurate villains from the greater multiverse bleeding through to E-199999; meaning those are from the parts of the multiverse that aren't live-action or part of this isolated MCU's branches.
Final Question: I personally take Blade onwards all part of the same live-action 'multiverse' due to its success and heavy creative liberties that comic book movies took after that point - so would you take everything PRIOR to that, starting with that laughable Nick Fury TV movie all the way back to the Captain America serial of the 1940s as extensions/branches of the COMIC portion of the multiverse? Meaning, they're not branches of the MCU's reality thus aren't fully connected. I see them as more or less comic-based due to the appearance of many of the costume designs and their lack of liberties with the source material.
The way I see it:
Connected
Earth-10005 - X-Men Cinematic Universe (Original)
Earth-17315 - X-Men Cinematic Universe (Revised)
Earth-26320 - Blade Cinematic Universe
Earth-48627 - The Punisher (2004)
Earth-96283 - Spider-Man Trilogy
Earth-120703 The Amazing Spider-Man Duology
Earth-121347 - Ghost Rider Duology
Earth-121698 - Fantastic Four Duology
Earth-199999 - Marvel Cinematic Universe
Earth-400083 - Hulk (2003)
Earth-701306 - Daredevil/Elektra Duology
Earth-???? - Punisher: War Zone
Earth-???? - Fant4stic
Earth-???? - Legion
Earth-???? - Sony's Spider-Man Universe
Not connected (but part of the larger Multiverse)
Earth-5556 - Doctor Who
Earth-5724 - Nick Fury: Agent of S.H.I.E.L.D.
Earth-22249 - Doctor Strange (1978)
Earth-51778 - Supaidāman
Earth-57780 - Spidey Super Stories
Earth-58460 - Man-Thing
Earth-58627 - The Punisher (1989)
Earth-59470 - Howard the Duck
Earth-94000 - Fantastic Four (1994)
Earth-400005 - The Incredible Hulk (1977)
Earth-600001 - Captain America (1944)
Earth-600043 - Captain America (1979) Duology
Earth-700029 - Generation X
Earth-704509 - Mutant X
Earth-730911 - Spider-Man (1977)
Earth-818793 - Evil Dead Trilogy
Earth-967064 - Captain America (1990)