I would've preferred a UEFI payload since that would simplify my #NIxOS configuration a bit.
Another odd end was that #alacritty, a GPU-accelerated terminal written in Rust, wouldn't start. Found the tracking issue here: https://github.com/jwilm/alacritty/issues/128
Fine, back to URxvt, but since I don't distribute my .Xresources the terminal comes up with a white background … ugh.
So much #NixOS and especially #homemanager configuration still to write.