Override Oculus Orientation 5.3

So with the new VR support the main camera's transform is being overridden with the Oculus transform.

I kinda get this in a general use case but I need to able to override this behaviour.

Specifically I want to override the orientation so that the real world Oculus orientation maps to a greater in-game orientation, particularly on the local y-axis i.e. when I turn my head 90 degrees in the real world, I want to be facing 180 degrees in game.

This is something I have done before in VR on...

Override Oculus Orientation 5.3