I agree Against a Dark Background would be better! Who would make it though? Banks is still kinda unknown, even if his work is probably as well known as Gibson's (probably the most mainstream SF author writing now), and Gibson only recently got a TV adaptation with The Peripheral. So marketing Banks without using his "signature IP", i.e. the Culture, would be hard.

Practically speaking it would be easier to make a new IP only loosely based on the idea of a woman being targeted by a cult for a year and a day, and filing off the serial numbers so to speak.

Anyway, I'm not a huge fan of A/V adaptions of the works I like. I've not seen The Peripheral show, but then I didn't think The Peripheral was that good as a book (and the second book was terrible).