Q. See questions above. Can someone who has not yet said Kiddush on Shabbos morning, since he has not yet davened, recite Kiddush for his wife before he goes to shul?
A. Chashukei Chemed (Megila 2a) maintain he can do so.
However Horav Shlomo Miller's Shli'a opinion is that he should preferable not recite Kiddush for her, due to the doubt in Halacha if the principle of Areivus, or guarantorship, that permits non-obliged people to be Motzi the ones that are obliged, applies to women.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit'a