I just caught most of One Flew Over the Cuckoo's Nest
on AMC, and Will Sampson, who played "Chief" Bromden, struck me as a very close match for the descriptions of Carter Greyhorse from the Stargazer
books. I wish I'd caught it before rereading Death in Winter
By the way, that movie has a lot of future Trek guests in it. In addition to Louise Fletcher as Nurse Ratched, of course, you've got Christopher Lloyd (Kruge), Brad Dourif (Lon Suder), Vincent Schiavelli (holographic salesman, "The Arsenal of Freedom"), and Michael Berryman (Capt. Rixx, "Conspiracy"). Also one person who'd already done ST, Peter Brocco (Claymare, "Errand of Mercy.") Not to mention Scatman Crothers and Danny DeVito (whom I didn't recognize with hair). I had no idea all those people were in that movie.