As the laws of physics do not seem to stop at the borders of a skull, there is no sovereignty of the Self. But no one minds a thought thinking itself its own thinker, as there is no one at all. Just a thought.
> As the laws of physics do not seem to stop at the borders of a skull
There doesn't need to be a magic dust for consciousness, it could still be a primitive compatible with existing physics. See what Roger Penrose worked on.
I.e. an intelligent computing engine which learns to model both its environment and itself, with some degree of access and control of its internal processes including when it considers itself.
At the point of clear, continuous practical self-awareness, how could it not be “conscious”? It will experience it’s self’s awareness of it’s self-awareness.