You can complete the 1040X in less than a half hour. It is not difficult. You need to be able to finish your nonresident return with Sprintax and print it so you can attach it to your amended return before mailing. Amended returns cannot be e-filed.
Have Sprintax help you with this question. I think it would be ok to say "no." as long as you can print your 1040NR return to attach to the amended Form 1040X and mail both together.
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