There are rumours around that someone out there already modified ALL hats for viera and hroth during Endwalker, and released an update for dawntrail stuff within 1 week after release.
Which by the way: it's honestly incredibly incompetent that as a developer you add new headgear for a new expansion that can't be worn by 25% of players (8 races, 2 of which can't wear the hats), for races that have been around for 5 goddamn years already by the time you release that expansion. It's mind-boggling how *stupid* it is.

And this person even customized the models so they would not clip as badly. Yes, also for pre-ShB stuff. All of the hats, every single one.
ALL of the hats.
I repeat: ALL OF THE HATS.
A SINGLE PERSON.
WITHIN 1 WEEK AFTER DAWNTRAIL WAS LAUNCHED.

... just pay that modder like a couple thousand for the models, yoink it and implement the things, employ that person or something as a freelancer or contractor for any future patches because *clearly* Yoshi P's team is incredibly incompetent and uncaring when it comes to this particular subject, so then fine, but let someone else do it who DOES care.
This is not rocket science and the work has been done already.