I was actually able to remove most of the solder with a hand pump. The pins on the sockets are so small, and the through holes so large, that it just sucked it right out. A lot of flux and flux soaked braid while wriggling the pins with the iron worked well enough to completely free them. I did have to cut the cross members of the bad sockets with a pair of side cutters to split them from pairs into singles. And also, the ground plane connections were brutal (only 4 pins per socket, you can see them in the picture, with solder still in the holes). I ended up using a tiny bit of Chip Quik on them because I didn't dare turn the iron up past 300. I'd heat the first one, then pull it free, then move to the 2nd one, until all four were "zippered" free and I could completely remove the socket.
And yes, anthon, the metal tabs are SO NICE. You just lightly press down on the tops, and the SIMM springs out.
I ran the machine overnight running Ramometer, no errors!
Now I'm distressed if I should remove the old Bank A sockets. Those ones weren't broken, but the board looks funny with half-metal and half-crap.