I know it’s a tough ask. In the meanwhile I’m exploring the possibility of embedding excalidraw into something else but I don’t know.

I already contribute to wikis on this topic, like Activist Handbook, but they are not the right format for what I need. Linked documents have limited expressivity and visual people are currently underserved, hence the diagram approach.

Another similar thing would be to use stuff like obsidian canvas which is something in between

There has been for years: NLNet. It just got suspended by right-wingers. A lot of European projects were relying on it.