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doomguy
Scilly.Suffolk
It's not just the threading of the DS that is different, the shell is wider (70mm vs 68mm) and of a greater diameter (36mm vs 34.8/9mm).
Facing the shell down is straight forward enough, but reducing the diameter less so.
A threadless BB is just as likely to be troublesome as an Italian one.
What are you trying to achieve with a conversion? All that an Italian BB needs is some Loctite 22 on the DS threads to stop it coming unscrewed.