Well, shoot. The "city" shifters are almost certainly also 22.2. It's the flat bar standard. Some other solutions...
- You could probably wedge them open enough to work.
- Paul Thumbies come in 31.8 size, and then you could use a shim from Problem Solvers.
- You could go looking for handlebars the right diameter. Gator Handlebar | SOMA Fabrications
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."