You might just need to continue to poke at ASUS' support team for a bit longer.
OR, you can to get in contact with one of ASUS' PR / Social Media people, and see if they can help push for a beta BIOS.
I don't know if ol' JJ at ASUS is still the guy to reach out to... he was like the Josh at Fractal...or Ed at Sapphire.
EDIT:
Looks like he might still be...on Twitter ...
Juan Jose Guerrero
@ASUSTechMKTJJ
