That's where it get's WORSE!!! Like I mentioned before... Mia is Hispanic. Cir-El's Kryptonian DNA came from Superman, but her Human DNA was leftover pieces of Mia. So while she resembled Superman in many ways... Lois took one look at her and went "Who's your mother?" 'cause it's obviously NOT Lois.
Simplifying it to a STAR Labs experiment with Kryptonian DNA would work nicely I think. Just say Mia was a Human who decided she was willing to let them do an experiment with grafting Kryptonian DNA into her and call it good. It keeps the main part of the origin(that's she's a Human with implanted Kryptonian DNA), while dumping the weird stuff. OOOH! Cir-El did actually meet Kon-El in one of the stories too!
For when my rants on the forums just aren’t enough: https://thevindicativevordan.tumblr.com/