Even if Apple don't provide the solution, how about providing API's for Spaces that we've been asking for over the past decade?!

I was randomly searching these forums and happened to see someone mention tccutil, which does exactly what I need. The man page has great example usage. Problem solved.

Maybe you want: https://developer.apple.com/documentation/security/keychain_services What does keychain services have to do with it? I don't see any new or relevant API's there, or am I missing something?

I completely agree. I played with the build configuration files yesterday and that's absolutely the way to go. Again, I really appreciate your responses - I'd blown so much time stuck on this and you instantly got me past it.