Lots of good advice here, thanks.
I'm a medical student and work at a different hospital or learning site every other day it seems. I certainly don't have an office and only rarely have a locker. I use my commuter bike as a nasty weather road bike too - so I like having some clip-less peddles on it and don't want to go with toe clips. I think I am going to have try the crazy conversion of some really big sole leather shoes to custom SPD. I'll let you all know how it goes.