Andy Horvath, Frank Glenn, they are both still in business and can do that work. Either find a 5’” 44 S&W Special barrel or supply a 6” Model 28. The 5” barrel will be fit and installed. The 6” barrel will be cut, bored and rifled. No big deal either way.
Great project and not a huge money pit. The end result may not be the $ sum of the parts but it will be unique and yours!
I converted a 4” Model 28-2 to 45 ACP more than 4 decades ago. Why? I wanted one and S&W had not offered one except on extremely special order. So, I built one.
Kevin