I interpreted it as HBO is simply sharing the universe of the original comic, while every other piece of media is in a different reality towards it.HBO's Watchmen used the comic as a history book, but it's not necessarily set in that comic universe; from what I take from the showrunner's words.
Doomsday Clock happened already and why have another sequel that doesn't fit with it?
I look at it as Watchmen (2009) being pre-Crisis and HBO's Watchmen being post-Crisis. Post-Crisis changed it to the Squid instead of Dr. Manhatten I guess. But HBO's version is pretty much standalone.
If they wanted to, they could Angela could be the new Doctor Manhatten in a live-action Doomsday Clock adaptation
Detective Angela Abar a.k.a. Sister Night is a main character and main protagonist in HBO's Watchmen. Angela Abar was born in Saigon, Vietnam to parents Marcus Abar and Elise Abar. Marcus was the son of Will Reeves and June Abar, two African-Americans who were from Greenwood, Tulsa, Oklahoma and...watchmen.fandom.com
Before Watchmen > Watchmen: The End is Nigh > Watchmen > Doomsday Clock > Rorschach
Watchmen: The End is Nigh > Under the Hood > Watchmen: The Ultimate Cut
Watchmen > Watchmen (2019)
Instead of complicating it, I would have had the comics as the main, then denoted the film and television series as [Film Reality] and [Television Reality].