Idiocracy: Luke Wilson, Maya Rudolph, Terry Crews
Back To The Future: Christopher Lloyd, Michael J. Fox
I’m sure more actors could join this effort as well. Even though they were only actors, they got to study the theories of time travel and how events of one time affect future events.
I’m half serious here, if anyone can reach out to these former actors in the context of time travel, please toss them the idea of reaching out to the current world leaders (and even citizens), to point out how they’re fucking everything up in a hurry, and more importantly how to start trying to resolve the problems…
Make a documentary about time travel. Start by describing the different approaches used in various popular movies and TV series (always using Primer or Tenet as a punchline about an approach nobody understands) but gradually have the focus shifting towards the consequences of time travel, and then progressing towards the realization that actions have consequences even without time travel.
All while keeping with your premise of using the stars of time travel movies as the main talking heads in that documentary, instead of using scientists (though by all means use scientists as consultants throughout!)