Thanks for making this available, I just flipped my RPi4 to aarch64 thanks to your work.
Just a heads up, the 03-08 rootfs tarball wouldn't boot on my 4. I tried two different good SDs and unpacked a half dozen times trying other things. Finally grabbed the 01-18, used that, and it booted the first time. Installed all updates, no problem. Once I can get a micro-HDMI cable, I'll troubleshoot a bit more for you. Thanks again!