Returning to it doesn't seem to be within the realm of possibility, given we leave this place through Astoria. But I also haven't extensively researched it, either.

[ they're coming and going so frequently that it doesn't lead much to stable research, but it's something worth considering. ]

I have a feeling we haven't seen the last of the King, if he's winding up in the same worlds that we're frequenting. He may leave us more clues yet.