LU: R’ Ovadia zt”l held very strongly that Jews in EY should follow the rulings of the Bet Yosef – he held that the Mechaber was the authoritative posek for EY. He also paskened that although one is supposed to hear Parshas Zachor read in the style they use (so a litvak may not be yotzeh if he hears someone read it with chassidish pronunciation), anyone could hear it with a Sefardic pronunciation, as that is the “proper” way to read it.
As for switching to Ashkenaz, I did that a while ago. There were a few reasons for it. Mainly, as R’ Moshe zt”l wrote, there is no explanation for why the chassidim changed the text of davening, and it was a change to the text that had been used for centuries. Why would I want to use it?