Rabbi Ahron Soloveichik z’tz’l paskened that the laws of stam yeinam did not apply to persons in the process of conversion, as they have already renounced idolatry by declaring their intention to become Jews. I once say one of his talmidim open a bottle of non-mevushal wine, hand it to a goy who was in the process of converting, and instruct the goy to pour it into his kiddush cup. The talmid then made kiddush on the wine and gave it to everyone at the table!
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