Since this thing is a driver, not a pretty princess - I yanked the tire/rim off earlier today and had at it. Bit of work with a file, and some other assault weapons, and while it won't win at the next customs and rod show it's good enough. The bead surface wasn't damaged, just the outer edge of the rim, and a bit on the face.
Now to go find a set of the correct size tires for it! Something with ACTUAL snow capable tread on them (these give great highway mileage, but they're hopeless in anything over 0.5mm of fluff).