Would they take a copy if someone from the usa scans and email you a copy of your natrulization certificate? I spoke with one of the contacts listed on nrna website and was told they would take a copy.
Please go to nrna.org , a pop up comes up with some contacts info for nrna ctzp and see if one of them can help u. I spoke with Saroj Dahal ji from the list last week.
Please dont forget to come back and share ur experience