OK well this is what I would expect a Lawyer versed in these sort of cases to say
Will need to see the full charge and any supporting documents
Will need to appoint a NZ Criminal Lawyer to advise on the case
Will want to find out if it is possible to reopen the case and change the charge to something US Immigration friendly, no idea if this is possible or would eventually work. But do not see an alternative.
So a complicated case, a long case, an expensive case with I would think with a low chance of success.