> I configure, build, and deploy everything from my nix workstation. I don't need to use the PVE gui at all.

I would love to know more about how you do this, particularly the deploy part. I'm considering moving away from Ansible, but haven't had the time to dedicate to exploring a similar Nix experience.

Just use Terraform against Proxmox and don't leave mysterious things nobody else knows how to work with.