Well, the answer from Hamilton Bowen was definitely yes. However, he stated,
"The cylinders shown in our parts catalog are blank, unfitted parts that will have to be installed by a gunsmith, chambered and finished. We offer this service but finished parts will start at around $495."
He further suggested that I look for a 9mm cylinder from one of the old model BHs. And, that they shouldn't cost more than $75-$100 tops for a good one.
So, I don't think I'm going to go after Mr. Bowens' cylinder. I can buy a used convertible BH for that, and a new one for just a little more.
Thanks for the info to do the chase.