There are a couple of live-action Disney films I could see being implemented in future KH games besides just Pirates of the Caribbean and Tron, but I think they have to be films that are on the Fantasy, Adventure or Sci-Fi genre like Pirates and Tron, instead of being live-action films that are grounded in normal settings (e.g. Newsies, Prom, High School Musical, Old Yeller, Herbie, etc.) such as the following films:I agree with the notion of no live action, only really applying to the remakes of animated properties. That said there arent too many successful or well known live action Disney movies I know of.
- Mary Poppins (the original 1964 film or Mary Poppins Returns)
- 20,000 Leagues Under the Sea
- Oz, the Great and Powerful
- The Sorcerer's Apprentice (2010 film)
- The Nutcracker and the Four Realms
20,000 Leagues and Oz are also interesting additions for live-action worlds to be implemented for the KH series as the former does have a following and is well-known classic Sci-Fi adventure film that would work extremely well, plus a boss fight against a Giant squid.
For Oz, the Great and Powerful, while it has received divisive reception, it was one of Disney's most recent successful live-action films outside of the Pirates films and the environment and locations of Oz could make for some interesting level designs even the Dark Forest screams KH level:
As for Sorcerer's Apprentice and Nutcracker, unfortunately given that these films performed badly at the Box office, it seems like those films might not be worlds, unless if Nomura and the developers are a fan of these films and want to have them implemented as worlds.
Also, we got the upcoming Jungle Cruise movie, while it's too early to tell how audience will think of this world, I'd be surprised to see this be implemented for the next KH game before KHIV or in KHIV, much like how Tron: Legacy which came out in 2010 while Dream Drop Distance was still in development eventually became a word 2 years after the film came out and Big Hero 6 got included in Kingdom Hearts III just a year after its movie came out in 2014.
I also think the live-action Alice in Wonderland and Maleficent could be the Only live-action remake worlds to be implemented in the KH series.