SCR - Use-cases for private+NHS providers

We have a client looking to utilise SCR/GP Connect.

I know that GP Connect is not ready for private providers at the moment (even if they have an NHS contract).

The webpage describing SCR is a little vague - does anyone know whether I would be able to advise our client that they can use SCR? If yes, are all of the connection options available to them?

They are a large mental health inpatient hospital, where their majority of patients are private, but they also have a NHS stream.

Thanks!