Your premise is wrong. You note that "I am not a US resident nor US company and cannot register a DMCA agent." Yes, you can. You and your own U.S.-licensed copyright attorney should follow the directions provided by the links below. Good luck.
The above is general information ONLY and is not legal advice, does not form an attorney-client relationship, and should NOT be relied upon to take or refrain from taking any action. I am not your attorney. You should seek the advice of competent counsel before taking any action related to your inquiry.