I think there would be definite interest in a murder-mystery style game; I know I’d be interested! I also agree with the previous replies, including the part about not getting discouraged. It’s probably better to think of a Choicescript version as the Deluxe/Remastered/Super Alpha Turbo version instead of a straight port: For example, adding new interactions or additional characters and different endings, like a Loss ending where you don’t collect all the clues/analyze them correctly or even an ending where you can choose, for a story-appropriate reason, to let the true culprit go or even implicate another character. This wouldn’t just attract players who are more used to the less-linear nature of CS games but would also give people who played the original text adventure version incentive to play the new one. Character creation is also basically a requirement at this point, even if the name and gender of the viewpoint character has nothing to do with the rest of the game, as some people won’t even try out a CS game without that minimum of customization.
I used to play a lot of IF some years ago and, at the time, I don’t remember monetizing parser-style text adventurers as being “a thing,” although I was just playing and not creating so I could be wrong. I think it’s worth giving this project a shot if you’re even slightly interested in learning CS, since as you said you’ve already got the heart of the game in place: Any extra content would be require relatively little time to create compared to making something entirely new, and I can see the concept of the game itself adapting well to the Choice of format. The demo for Samurai of Hyuga Book 3 has a sleuthing element and I enjoyed it greatly; as much as I love narrative-based games, I also really enjoy it whenever a CS game incorporates more “game-like” elements (puzzles, ect) that are more common in parser-type games.
One specific bit of advice, if you do go ahead with it: Twenty-odd options on one page might get a little cumbersome, so it might be a good idea to split the clues up into different categories so the player can select subpages of clues instead of having all the clue-options on one page. Not sure how you’d prefer doing this (clues separated by the character they’re related to? Maybe by the location the clue was found?) but I think it’d make examining and talking about the clues less of a chore and easier to take in at a glance, ex. “These are all the clues related to Bob the Grocer” or “These are all the clues I found in the library.”