Simon, yep your Fleming solution is fine. I know it doesn't say "Actor" beside it, but he is appearing on screen as himself and it was theatrically released apparently on Dec. 28, 1919. So it's good.

Cecil B DeMille (Hollywood) Charlie Chaplin (A King in New York) Dawn Addams (Vampire Lovers) Peter Cushing -- Grand Moff Tarkin

There, I have now shortened the Charlie Chaplin linkage so it will be easier down the line to use his name. Who knew that Chaplin was only two degrees from Star Wars?

Next is William Wyler (yes, you will have to use "uncredited" appearances to answer this one).