I eventually bought some Mavic shoes in size 48. That's about the biggest size made in most bike shoes. They barely fit. Then Thursday, I was carrying them to work in a tote bag while riding the subway and also wearing my regular backpack. I forgot the bag with my shoes on the subway. $160 down the drain. Ouch. I filed a lost and found claim with the MTA, and they have a nice web page for that. I got an incident number. But my chances of recovering are not good.