I’m fairly unaware of the current state of Linux on Apple M hardware, but I’d want a Linux partition on Apple hardware more than a Mac partition on x86. These days I have two devices though.
I used one of their releases rather than building my own image. It’s a guide that merits careful reading, as some key steps are not specifically bulleted. Oh, and it’s not the NixOS graphical installer.
But it was dead simple, and 99% of the heavy lifting is from the Asahi team. The biggest downside is that updating the support files is a manual process, but NixOS of course makes it a breeze to rebuild into a new environment—and back out if it doesn’t work.