Unless that model originally offered a .22LR cylinder, it'll be cheaper to buy a Ruger Single-Six than to have a cylinder made for that Italian revolver. The bore diameter may be wrong, as well. The .22 WMR uses a nominal .224" bore, while the .22LR uses a .222" one. Revolvers with both cylinders often use a bore diameter of .223" as a compromise.
And then there's the safety issue. That should be gunsmithed back to a safe condition before ANYTHING else is done. If (and that's a big IF) parts are obtainable, it may be hard to find a 'smith that will even touch it.
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