I wouldn't keep telling the HSP story. I did that myself in the past and my mother still tries to convince me how important it is to acknowledge that. I decided against it and I do feel a lot better it since I dropped it. Sure, I have still beliefs about how I have less filters and am more sensitive to stimuli..but seriously, how can I even know? I won't ever be able to experience how another person experience all of that. It's just a lable you put on yourself. I am a believer in being able to become the person that I want and that can't go together with the belief that I can lable people in a certain way.
To be honest, I wouldn't go for a narcisst. You have already strong beliefs about such a person and even if you are able to completely shift your image of them, there is still the risk that you look at the changed version of them and are afraid that they will fall back or wonder how long it will take until they act "normal" again. I know for myself that this is right now more than I would be able to accomplish and I am practising for over 2 years now. If you think you can focus on a great version of them constantly without ever looking back, then go for it.
"Self-abandonment. That is the secret. We have to abandon ourselves to the state, in our love for the state, and in so doing live the life of the state and no more our present state. And to make the state alive, one must become it."
Neville Goddard ~ The Law and the Promise