Hi! I’ve just created a repo with pre-built minimal images and a little guide on how to get NixOS on your uConsole (CM 4 only as I can’t test CM5 right now!).
It’s based on johndoe’s work and some other stuff and aims to be mostly effortless
You can find it here: GitHub - nixos-uconsole/nixos-uconsole: NixOS on ClockworkPi's uConsole (CM4)