So my question is as follows: Is it even possible that she liked ANYTHING else about me ? Any of the many positive attributes that I know I have ? Is it even possible that she feels anything approaching remorse for her deception & obvious intention to use me for financial gain ?
Yes, she probably did genuinely like many things about you. You probably have traits that she found compatible with her own personality and temperament, or otherwise endearing. But if she was a pwNPD, she needed more than just someone she liked. She needed someone who was her ideal foil, who would put her on a pedestal and worship her forever, and with whom she would never get bored. I think it goes without saying that such a person doesn't actually exist, which is why so many Narcissists have unhappy long-term relationships, or are incapable of holding together a long-term relationship. (Keep in mind that this is not fun for the Narcissist either.)
Do people with NPD ever take stock and think it might be nice to have a mutually respectful, honest and emotionally intimate committed long term relationship ? Or is that just something that seems too routine & boring to be an attractive proposition for someone with npd ? No sarcasm meant here; I'm legitimately curious. And if no remorse, why no remorse [probably an unanswerable question, I know !] ?
You seem to be thinking more of BPD here; many pwNPD like routines, as it gives them control over their environment and minimizes unpredictable events. Many Narcissists get married and stay married, even if they are unhappy with their spouse and don't really understand why. My guess is that most Narcissists actually do want the kind of relationship that you describe, but there is tremendous difficulty in approaching people apart from the idealize/D&D cycle, and then of course there's the difficulty in building a long-term "love" relationship that goes beyond infatuation or keeping the person around for appearances and supply.