In your view why is using the AuthZ server SDK not a good solution - or maybe other way around, what would be a more general solution?

I was more musing than anything else. I don't think application data is standardized enough to use a more general solution. This is true across all AuthZ servers; it's not an OpenFGA problem.

Maybe there's a mapping layer that is possible (similar to ETL) that moves it out of code into configuration? But I'm not sure.