Well, I just sent the "Single-Six" off to Ruger. It would seem that my advisors were right. Ruger doesn't change the pistol to add the transfer bar other than to replace a few parts, and the beauty of it is that they send you the old parts back so you may return the pistol to its original condition if so inclined.
The cylinder issue is rather strange, Ruger can only fit a new cylinder if the S/N is over 150,000. luckily mine is. So I'm getting a new .22lr cylinder fitted and while they have the revolver, I've asked them to reblue as well. They only charge $35 for the reblue and the cylinder fitting is forty-something.
Thanks to all for the good advice.