Thanks for the recommendations, everyone!
As luck would have it, I dropped my racquet off for restringing yesterday and the place I go has shoes. I never noticed before because they're situated in a weird, out-of-the-way place in the store. They had 2 pairs of T22's left in my size, so I picked both of them up.
So crisis averted for at least another year... by which time, either the T22 will be back on the shelves, or I'll be trying out your suggestions.