That’s hard, because I’d be mad about a lot of books I love if they didn’t pick my style of playthrough as canon! I agree with so many above that Fallen Hero would be brilliant, but I would want them to have my motivations and romance Ortega and so on.
I think Tally Ho would be my pick. I love ALL of the options in that one, it’s hilarious, and the costuming would be delicious.
Man, now I’m going to think about my personal perfect cast…
EDIT: Yeah, here's a first pass on the fancast
Rory: Phoebe Waller-Bridge
Aunt Primrose: Emma Thompson
Mopsie: Yara Shahidi
Figaro: Kumail Nanjiani
Frankincense: Armie Hammer
Regina Wilhelmina: Lucy Liu
Haze: Ezra Miller
Col. Firesnuff: Jared Harris
Valentine: Timothee Chalamet
Investigator Ambrose: Daniel Craig*
Trina: Storm Reid
*I wouldn’t have guessed it, but he was delightful in Knives Out as private detective Benoit Blanc.