Jay Angler wrote: 3 or 4 cup hooks in the ceiling that you gently wiggle the finished shade onto, would be what I would try. T
I keep thinking about this, which makes me think there's something promising here. The ceiling is poured concrete, and the fixture is one of those standard socket things shown below, but it's not porcelain so I think it would be easier for me to modify it than to get hooks into the concrete. In fact maybe the frame, if I could find myself some sheet metal, could go underneath the socket (which is screwed flush to the ceiling)?
going to chew this over all day today...