Can you leave a pair of shoes to change into at work or carry them with you?
Also, I think it's a little ironic because you wouldn't wear suede in the wet, but you're okay doing so with Cordovan!
Why not winterize a pair of boots with obenauf's or such? I've had decent luck with the stuff and wear some boots with the treatment in the wet and in the salted snow.
I don't own cordovan boots, I'm only pointing out that many of them seem to be made for bad weather. That seems counterintiutive given pbooth's assertion (that I have read here from other posters as well) that they are a poor choice for bad weather. I always thought sueded to be more delicate than leather, so my hesitation is based on preconceived notions rather than their actual performance. The only suede shoes I own are Ferragamo bit loafers and a pair of JM Weston captoes, so I wouldn't wear them for bad weather regardless because they aren't boots. I keep a few pair of shoes at my desk in case I want to/need to change them for whatever reason.