It has already [been established](https://judaism.stackexchange.com/questions/9308/is-it-required-to-stand-during-kaddish) that Ashkenazim generally stand for Kaddish, while Sephardim sit unless they were already standing. (That said, I have observed Sephardim who _davka_ sit for Kaddish.)

What should an Ashkenazi do in a Sephardi shul? Should one _davka_ stand? On the other extreme, is it even permissible to go against the _minhag hamakom_ of sitting? Conversely, should a Sephardi stand or sit for Kaddish when praying at an Ashkenazi shul?