The biggest problem you will encounter, is finding the previous iteration of Uberti Hammer and Trigger. Uberti has a nasty habit of not supporting previous iterations of parts, once they have "Enhanced" something, that's it. No more of the old parts. Once the usual suspects (EMF, Dixie, Taylors and Cimarron have run out of the old pattern parts, Es tut Mir Leid.
Although I haven't tried it in a Lustrum or so, you may be able to substitute Pietta hammer and Trigger. Don't quote me on that.