I decided to switch to NixOS on my router as part of my crusade to switch most of my devices to it. So, here is how I did it! This post is more or less a raw thought stream from during the setup process. It also resembles a tutorial - that is purely because it makes it easier for me to write, this isn't really intended as a tutorial, more as an explanation of what I did - you're free to use this as reference though!