Charlie: Need to abide by its minhagim. (Halachah actually requires that.)
You might be required to shake Lulav Sephardi way, but do you have to eat kitniyot in private?
Maybe if you are invited to a seder and afraid to insult the baalat habait, you can say that you can’t stand spices and nuts?!
I know of a Sephardi Rav who tells his kahal to use Ashkenazi Eruv, but does not seem to carry anything himself. Maybe that is why he wears the mask properly? so it would not be considered carrying. CALLING ALL “HASIDIM”