Getting a 9mm barrel should not be a problem and you have the ability to cut whatever threads you need. Of course, the price might be higher than you want to pay.
If the barrel is worn or rusted out (and not bent or cut) How about considering a barrel liner? Gun Parts Corp has 9mm barrel liners thick enough to stand that pressure, and the standard drill and reamer should work OK. Not too cheap but probably not budget busting either.
Jim
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