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Idea: A free and open-source web repository of Sigma detections where users can find, contribute, and suggest edits to detections. All user contributions will go through a StackExchange-style moderation queue. Built-in conversion from Sigma to the query language of your choice.
The other thing that came to my mind is the OWASP ModSecurity Core Rule Set (https://coreruleset.org/), which seems somewhat analogous to your proposal. If so, it might be worth chatting with some of the CRS maintainers about what their journey was.