Vector,
Interesting take! Could be. Not really possible to tell if she'd be cool with that - truthfully my sense is probably not (she declined my kiss before I threw up the boyfriend frame and she qualified herself as a poor kisser) but I can't be sure. Food for thought anyway!
I agree with you certainly that it's a framing issue - but here's the perspective I look at it from. My belief is that where I really screwed up this pickup was in A3. "The book" tells you that if you have compliance and you are screening then you are doing your job in A3, and that the point of A3 is to get to comfort and 'normal conversation.' I think that ad verbatim this is a little misleading (i just used 'ad verbatim' in a sentence, sweet.)
I'd suggest that what I failed to do was to create a sense of GENUINE connection on any level other than physical attraction. In other words, while I went through the correct motions and qualified her, I failed to actually convince her that I was attracted to her for qualities which would make the pickup "special" and not put me in the category of 50 other "Peter's." This is how i interpret her desire for something "REAL" she isn't getting from me at the bar.
So to follow this line of thinking, with her presumption being that I'm in to her for looks and fun, it's not congruent for me to set a "boyfriend" frame in that atmosphere - and this is what you're picking up on. Ergo my lovely target throws up congruence tests.
In English, what I needed to do that I missed was to do a better job of complimenting her and getting through to her that I think she is special, and we have something special because I see qualities in her etc.
