See, this is the splitting of the hair that no one can/will answer. Pretty much the advise is to prostrate yourself on the FAA, be polite and apologetic and it'll all turn out as it turns out.
Not wanting to be confrontational, and letting the questioner know that I'm trying to help them do their job while retaining my claim of innocence is what I'm after. Anyone can tell the ATC person who requested a phone call to get stuffed, but of course, knowing human nature, they will take that position that the rights of the accused should be well exercised and forward that to those who's job it is to investigate further, and violate where they think appropriate.
Of course, it'll all be couched in the legalese and the defendants attitude will never be formally mentioned, but if you decide to stand on prinicpals and not admit anything, you are dickering with the very real probability that the FAA is going to make an example of you.
In the case I used, if one is accused of clipping the Bravo when no such action occurred, I want to know what magic words to say to the guy on the phone with all his 'why ........?' questions absent a direct admission of what I'm accused of. So, I guess since no has an answer, or they have it and aren't willing to share, I'm going to go with my original thesis and tell them I'll review what transpired, ask for the best info they have on the situation and get back to them with a definitive statement at a later time. While not actually mentioning the PBOR, I will certainly be thinking of the protections offered, limited though they may be.