Many thanks to all for your quick and accurate responses to my query yesterday.
My EUA did in fact clear right at the 72-hour Gold window without any action on my part.
I was just concerned that the mangling together of my first name and middle initial would cause eligibility problems.
I do believe that NW's EUA system would in fact pass over an otherwise eligible Elite if it found a mis-match as I described - hence my concern.
Thanks again.