jpw, I believe your best source would be Hayes. That said, I communicated with them (they are extremely helpful) last year and assured me that there would not be a problem to get it working.
As Adam mentioned, 22mm calipers seem to be plentiful. You would be looking at the G1 instead of the G2 mounts though. I am running Hayes HFX Mag+ which comes with the G2 mount so I had my LBS swap it and it works great now on my CHT.
If you are in the UK, Hope has a disc brake which would work too.
The CHT is a beautiful frame. Rides absolutely wonderful too. Btw, you might like to note that they run a little short on the top tube length.
Go for it!
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