But now I'm actually not so sure. You seem to not admit of a category of things that physics can't explain. There are things it does not currently explain, things it has not yet explained, things it has explained wrongly, and things it may never explain as an historical matter. But not things it can't explain ("can't" in the sense of "is incapable of").
Do I have you right on that?
If there is a separate world outside of this world etc, then that would get incorporated into physics. I don't see how any scientific explanation for consciousness wouldn't become a part of physics.
Basically, physics describes all the rules of this world. Consciousness exists and is a part of the world, so it is a part of the rules of the world, so it is a part of physics.