You guys have convinced me. I'm going to pick up a 32GB and see if that lets me recover my bricked reader.
Btw, you can also check out Sony's compatibility information on SD Cards.
https://www.sony.com/electronics/sup.../W0008188M.pdf
Edit: I did try a 32GB card and still no luck debricking. I really messed that poor reader up. I wish I had another plan.