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.22 is probably your only option The 950b also came in a .22 version so that probably would be a easy conversion (if they had a longer barrel)but the 935 only came in 32 so maybe it could be relined to .22
Epp's converts 32's to 30 Reid which is a necked down 32 case, but it is reloading only. Converting a centre fire to a rimfire is going to take a lot more work than just a re barrel, and they're not worth that much to begin with