fuchsiaaaaaaaaaaaaaaaaa
hah this was such a brain weird moment, testing my usb-cereal crossover cable between new server and thinkpad, accessing both over ssh from my desktop..
and typing in one serial console seeing it show up on the other :3
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current status is a working custom NixOS live iso, giving a tty over the serial link. To be done is getting boot/kernel logging there too
oh and generating custom NixOS iso's is absolutely incredible, this small snippet of Nix is all you need to creat fully configured system installers (with things like enabling serial, opening ssh) https://github.com/asconix/nixos-setup-minimal-installation-cd/blob/master/iso.nix