SS,
I drink NA champagne all the time -- no trigger at all. Also NA mojitos etc. Don't like NA or beer. But others have had different experiences, so I think the question is whether it is worth the risk. I had drunk the NA stuff when I was pregnant and knew it would be OK.
But, and I mean this in the nicest possible way, each of us knows our motivation in doing what we do, and as long as your intent is to stay sober and this helps, I think only you can decide.
I want to say about your charity gal, I have met just her type in London and I am with you -- forget the resentment stuff, those folks are just rude.