I'm not NPD, but I have quite a bit of narcissism. I know for a fact that it's made me need to see myself in too great a light and stand out substantially above others.
I've sort of dealt with this by (narcissistically) supplying myself internally by taking pride in the fact that I analyze my weak points openly and carefully, being a machine that improves itself much more quickly than others by mimicking and adapting the traits that others have an (initial) advantage of over me. It's narcissistic "humility."
I use the thought from Ralph Waldo Emerson: "In my walks, every man I meet is my superior in some way, and in that I learn from him.” It allows me to be okay with people being better at things than I am. Because I'll simply learn from them how it works and my base of intellectual traits will grow while others' will stagnate. Over the years I'll expand my personal potential, while others will not have a broad enough vision.
I put a lot of weight on what I will become and that I can adjust things about myself, and it reduces my need to use other people for supply. It's like my new supply is watching the products of my efforts appear within myself and in the world.