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Is there any special reason you want a 4.5" barrel? If I were going the route of buying a larger gun and having a gunsmith cut it down I would choose a length between 4.14" and 4.2", as it would keep the gun Canadian restricted and still be legal for the US IDPA revolver rules. American IDPA Enhanced Service Revolver (ESR) Division and Stock Service Revolver (SSR) Division require require revolvers to:
Have a barrel length of 4.2” or less (as measured from the front of the cylinder)
So over 4.13" keeps it Canadian legal (restricted not prohibited), 4.2" or under keeps it American IDPA legal for ESR or SSR; If I ever get good enough at IDPA to compete in the States. There are of course other distictions between ESR and SSR (mainly weight and the use of moonclips) but I digress.