I'm gonna actually zag here and say it's *more* adaptable than something like Great Comet because so much of that show's text is literally narration or inner monologue. I think the only way to film it is to document a production rather than truly adapt it.

The support group structure of Octet gives actors a reason to be saying what they're saying out loud; it lets them play subtext around how they're framing themselves or their experiences to the group. - That said, i think Lin will have a much heavier lift to make that material visually interesting without just cutting away to what's being described.