Yes, it will fit.
Yes, it will fit.
Other suppliers won't produce such a high profile component; cooler manufacturers don't typically offer such thin heatsinks. No matching boards were located, though the X470 model is referenced here https://pcpartpicker.com/b/ft29TW
This setup works well for those who want to explore further. I own a Chromax Black with an Asus X570 I Gaming ITX.
Thanks for responding - while I didn't ask - it's good to close the loop on this, especially when noctua themselves say it won't fit - https://ncc.noctua.at/motherboards/model/ASUS-ROG-Strix X570-I Gaming-4188