I recently wanted to build Python wheels for a whole bunch of Python versions and packages on Mac ARM64. I ended up using OSX-KVM, and then using cibuildwheel to crossbuild to arm64. Pretty dang easy.

I set up OSX-KVM (https://github.com/kholia/OSX-KVM) and it worked really well. Having archlinux is a huge plus for this (it's why the docker image uses it), as qemu is super simple to setup and get running. Was surprised how easy it was, but given how much effort the bootloaders have had over the recent years for Hackintosh, qemu users can just yoink that bootloader and use it.

Surely you mean fewer steps (e.g. "docker run [image]" versus the long set of prep/install steps in the OSX-KVM README)?

IIRC, when compiling any iOS apps, etc. you need a Mac machine. I remember in the past, when I was creating CI/CD pipelines we had to ensure that there was a Mac Mini or some other machine that we had access to in order to automate this.

Seems like this solution would make it much simpler, as we used Docker for everything else.