I am also Sephardic, I’m Orthodox, not a BT and still keep all of our customs so there are some left, but I understand the frustration in trying to find an Orthodox Sephardic rabbi that follows the Sephardic minhagim. There are rabbis who are working to preserve our minhagim it just isn’t as big of a community as the Ashkenazi Charadi one so they aren’t as noticeable. Preserve the minhagim in your own home, and there is nothing wrong with a Sephardic Jew wanting to join the much larger Ashkenazic community, they have a lot going for them and in the end it’s his choice. Preserving the Jewish people and the Torah is much more important than the customs of a community. Yes we have a strong heritage and many gadolim but if the Jewish people become unified into one community it’s not a bad thing.
That being said I’m Sephardic and proud of my heritage and the great Sephardic rabbis that I come from and I don’t plan to change my minhagim 🙂