Removing Side Curtain Holder Sockets from Door?

[MikeC5]

I know someone out there who has done a thorough restoration has wrestled with these. I have a '25 touring car and I'm guessing it is the same on 24 - 26 at least. I'd like to know if there is any way to remove the side curtain sockets without destroying them? In the attached photos, there is a bracket that is riveted to the door into which the socket seems to be permanently attached. It appears to be welded on the tabs (which show no inclination to bend up). It would be easy enough to grind down the rivets and remove the assembly except that the part that sticks through the top of the door is rolled over (like a tubular rivet) and won't fit through the hole in the door unless you 'unroll' the tube. Has anyone dealt with this?