I haven’t done this myself, but here are two threads that might be helpful to review:
First, a post-mortem of At King Arthur’s Christmas Feast, a really well-done adaptation by @MoyTW of Sir Gawain and the Green Knight into ChoiceScript. There’s good info on what that process looked like, and a discussion in the thread of other IF adaptations.
Second, a post about adaptation occasioned by the author (@mathbrush) writing a game version of a couple of Sherlock Holmes stories, which might be pretty on point for what you’re looking to do.
Hope these are useful!