ildiem, I like your suggestions, thanks! Messenger is great. Genocide is… maybe too spoilery to be a title? Perhaps ‘Flashpoint’?
I think I’ll most likely call Rogue One simply “Andor - S03E01 - Rogue One”, and name the project “Rogue One: The Andor Movie Omnibus Finale”, for the clearest possible communication of wot it iz.