@Megatron the Marvel Appendix is starting to get to these external properties especially the Transformers stuff now btw.
Hopefully we'll get reality numbers for Invincible or Image stuff soon lol
There are so many Marvel related Transformers realities that can be numbered.
-UK alternate timeline where Galvatron kills Powermaster Optimus.
-the G1 cartoon (it's a Marvel production)
-Regeneration One (Marvel continuity continuation, albeit in my mind, this is Earth-91274)
- Classics continuity (Marvel continuity What If timeline, even had cameos from Spider-Man, Luke Cage and Invisible Woman). The fact that this reality wasn't published by Marvel wouldn't matter, as the Appendix numbered realities that appeared in external properties, such as the Silent Bob Daredevil and the Simpsons X-Men.
-the IDW 2005 universe, as the Marvel crossover is canon there (alternatively, the NA/TF crossover could be removed from 7642 and placed solely in the IDW 2005verse)
-Fleetway G2 (it had licence to publish Marvel G2 issues, so it counts I guess.)
-Maybe FunPub Shattered Glass continuity as well, as it is a mirror universe to the Marvel branch Classics continuity, and even features an evil Spider-Man counterpart named Arachnolord.
Transformers is messy, as the Marvel Content now references to both UK and USA events, so if Marvel divides them, I'd ignore it tbh.
In my mind, the UK stories (Earth-120185) lead to G2 and Alignment (the la
tter story references the UK Galvatron by saying the US Galvatron is Galvatron II, meaning there has to exist a Galvatron I), while the continuity strictly including the US-only stories, Earth-91274, leads to RG1 (the biggest divergence of the US comics is that GI Joe crossover miniseries).
As for the Marvel GI Joe side of things, I consider only their crossovers with Transformers canon to the TFverse (assuming the UK and the US GI Joe comics condradict each other, which is what I have heard).
This approach just feels cleaner than a dozen universes with minute differences. I wonder what Simpn Furman would say to this idea?
BTW, I previously thought Simon Furman's Omega Point (but not the rest of 3H comics) might have fit into the continuity of Alignment as well. However, Omega Point says the events of the 86 movie happened in 2005 (which is not the case in the main comic timeline), so that story is more like an cartoon/comic amalgam continuity or the cartoon continuity itself.