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The number is from the link above. I am pretty sure that is the one I called. I had an early J frame I wanted to convert to a 32HR so I called... It is possible I got in contact with the custom shop... (No they wouldn't convert it...)
Why don't you reline the barrel and make a new cylinder???
My dad had a S&W .32 kit gun with a 4" barrel. The kit gun is a J frame. You may be able to find a kit gun with a snub barrel or you could snub it yourself.
I ended up with dads guns and gave the kit gun to my sister.