If Matzah is mezonot for some Sepharadim, and Shabbat were to fall immediately after Pesach, what could such Sephardim use for hamotzi on Shabbat, given the obligation of lechem mishneh? One could not use Matzah, because it is not considered hamotzi in this scenario. One could not use leavened bread because one could not own or buy it during pesach and one could not buy it once Shabbat has started.
If you are kove'ah seuda on a mezonot food, treating it as a meal rather than a snack, then it is treated as hamotzi. That should solve the problem. Source: http://www.kosherveyosher.com/hamotzi-vs-mezonos.html
He can make a nice fluffy challah out of matzah meal.
Although it was a Pas Habaah Bekisnin while it was flat it would become Hamotzi when changed to proper bread shape. As we find regarding the cooked food being re-baked.
חָלוּט (פֵּרוּשׁ כְּמִין פַּת חוֹלְטִין אוֹתוֹ בְּרוֹתְחִין) שֶׁאַחַר כָּךְ אֲפָאוֹ בַּתַּנּוּר, פַּת גָּמוּר הוּא וּמְבָרֵךְ עָלָיו הַמּוֹצִיא.
A Sephardi person could make an Eruv Tavshilin by setting aside a certain amount of flour to make matzah with. Then he may use that flour to make Soft Sephardi Matzah which he can then use to make hamotzi on for Shabbat.