A big list of non-second-person IF: ifdb.tads.org/search?searchfor=t … g%3Asecond
In my experience, choice-based IF reads somewhat more like a non-interactive novel, but I agree with those who suggest that it’s essentially blowing up your novel. Your existing story might form the start of a reasonably good outline for a choice-based IF.
Here’s an interesting take on that from the author of Choice of the Deathless.
Or if it does, the interactivity might best be realized as a sequence of actions which are not about searching for clues.
I found some helpful info here as well:
inform-fiction.org/manual/html/s47.html
Starting with: “Book adaptations present two main problems…”