TLIK
” The Sephardic community was never issued those decrees, though by now, they have been accepted as universal practice. “
Vi shteit? Teimanim still practice polygamy. Even Sephardim don’t have a ban on it though most add a clause to their kesuba agreeing not to take a second wife. And regarding not being able to divorce an unwilling wife, what’s your basis to assert that Sephardim cannot do so?
Chacham Ovadia Yosef zt’l said Sephardim shouldn’t adhere to R”G’s cherem.