Update on the renunciation of non-existent citizenship. My OR inquired with their CO and was able to forward me a letter template that better suited my situation:
"Dear Sir/Ma'am,
Effective the date of this letter, I, [your name here], respectfully and voluntarily renounce my eligibility for citizenship, along with all benefits and obligations which it may have imparted, from the country of [name of country].
Having been born to [nationality] parents, I understand that I have the right to apply for [nationality] citizenship. As of today, I do not, to my knowledge, have [nationality] citizenship. Nevertheless, I am voluntarily renouncing my right to apply for [nationality] citizenship for the sole purpose of obtaining a commission as an officer in the United States Navy and only through the duration of my enlistment in the United States Military.
Very Respectfully,
[your signature] + [witness name/title] + [witness signature/date signed]
Send all this to the embassy via certified mail and request a return receipt.
Hopefully, I should receive security clearance and fin-sel letter soon.