Thanks, Hayo. This reminds me, sort of, of the old Capture NX and NX2 that stored the original image, edits and a preview backing the NEF after editing. Very efficient. PM displays those just fine.
Anyway, I would like to see the Luminar file problem solved in PM. I really like it as an editor, but managing the files in PM, especially not having them handled as an image file in PM, is making that difficult.