(At least, I have never seen this done at any wedding that I have attended.)
Actually, I've been to a Temani wedding (with an Ashkenazi bride) and the Chattan did make the brachot of Kidushin.
I no longer recall if he said all the 7 brachot afterwards, but I don't think so.
Although the Chattan should recite the Berachot, as it’s his Mitzvah to get married and start a family, usually, the Mesader Kiddushin recites the Berachot, so as not to embarrass Chattanim who don’t know how to do it themselves. (Rama and Perisha Even HaEzer 34:1)
Since the Rambam holds that it’s a Birkat HaMitzvah, the Chattan should ideally appoint the ...