I've often heard this said, that DnD isn't always the best system to base things off of when trying to create a game for any given piece of media, simply because it's one of the most popular systems. Obviously there are a ton of other rules systems out there, but I'm not personally familiar with...
Just binged the whole of Shadow and Bone on Netflix in one sitting and absolutely was enthralled by it. Immediately I want to run a campaign of the story arc from season 1, it is just so incredibly masterful. Went searching and found this thread, did you get anywhere with your work on this?