With this being based on "Best Actress" (of 1963), with Zeta-Jones as de Havilland (a long-time Davis friend who supported Davis's oscar race) and Paulson as Page (who was nominated), and with talk about the following season being devoted to the de Havilland and Fontaine "FEUD", it appears we might also have some star casting for Bancroft (who won the oscar), Katharine Hepburn and Lee Remick (also nominated) and, at least eventually, Fontaine.
Let the "for your considerations" begin. Diane Lane might make a convincing Fontaine.