That is also a possibility that I’ll consider. I might actually write both ORC stuff and something for the Miskatonic Repository. However, I do want my own approach even if I write something that’s specific for CoC. Are there strict guidelines for how the text should be written? I mean how you structure a mystery, what kind of images you can use (open access photos, AI images), and if you’re restricted by a detailed canon (events in other scenarios, well known NPCs, exactly how Arkham is described etc.).
Another aspect of all this is that I’m kind of both indie and OSR in how I view RPGs. That also change how I do things, even though I’m not rigid about how an RPG supplement should be structured.