It's still open to anyone and to all ideas: art film or biopick; documentary or invention; ballet-centered or romance/sex-centered. Please join in.
Quiggan, your smaller art film is beautiful. Would it be possible to open it up a bit, perhaps moving back and forth between the young Balanchine starting his romantic and creative life and daring to flee from the Soviet Union and the older, established Balanchine, now established in New York City, during the days of his pain about Farrell? This would make the film longer but would have the virtue of letting us know something of what happened to the young man.
I would prefer an art film myself, but ... if we go with a miniseries ... should it be like The Six Wives of Henry VIII, with each episode involving a different wife (plus Farrell -- though apparently NOT Morkha

)?
Would a 9 Muses theme work? Each woman would be placed in a particular setting important to B's biography. We could show him working with each on a ballet from that period. . I don't know enough about figures like Marie-Jeanne, Davidova, etc., to place them. Aroldingen was important to him, but that's not much of a story.
Dirac, I'd certainly add Hayden/Eve Arden figure starting with the LeClerq episode. Perhaps she and Danilova could observe and comment over a cup of coffee after class. They'd be skeptical and acerbic-- but deep down they really love the guy.
I can think of 7 women at least who tie to the important periods in GB's life and who can be attached -- accurately or not -- to an important ballet of the period.
Danilova (Russia) -- show them learning something familiar to the audience like -- something everyone knows is "old" and "formal" -- but experimenting with more modern work late at night in a garret somewhere in Petrograd.
Geva (Diaghilev Ballet -- Apollon Musagete, which introduces Stravinsky. You'd have to stretch the truth and pretend that Geva danced Terpsichore.),
Zorina (Hollywood and Broadway -- On Your Toes),
Tallchief (starting the New York City Ballet. Firebird),
LeClerq (tragedy and betrayal. La Valse)
Kent (Can we invent for her a central role in a "Return to Russia" episode? And have them do Seven Deadly Sins? I admit this is a stretch. For the purists, have them do Sonnambula.)
Farrell (l'affaire Farrell. Don Quixote. Followed, after her return from exile, by Diamonds.)
If we cast dancers, who, I wonder, would be best for each of the women?