I did the same thing back in the early 80's
There were no guns chambered for the 44 special, only mags.
And I wanted a 44 special. A gun smith found me a very clean S&W mod 28 in 357 mag and recut the cylinder to 44 sp, He then added a 3 inch douglas barrel and on the tang added a spring ball and then cut a small indent in the frame of the gun. When the cylinder is closed it locks it into the frame.
It is one of the best shooting guns that I have ever owned and on a Ransom rest with 240 GR SWC and Hurco powder it drilled 6 holes less than 3/4 of an inch at 25 yards.
Of corse several years later Smith came out with the N frame in 44 sp again in the mod 24, which I also own one now.
Would I do it again? it was way way way to expensive, but yes.