Unfortunately not. I already have a suitable single file OpenVPN config file and that is all the above seems to discuss.
The problem is having a binary i.e. part of the Mac OpenVPN client which has a command to import that config file. I examined the app bundle and inside it could not see an obvious candidate to do this - or at least none that gave back any helpful message via the command line.
To reiterate if it can already do it I need to know how to tell the Mac OpenVPN client to import an existing OpenVPN config file, or this feature needs adding to the OpenVPN client on Mac.
It can obviously be done via the GUI but that is not ideal for automation, at a minimum it would mean it could only happen via a logged in user session with users manually running an installer.