Yeah, lol. After experimenting w/ cluster setup for a few weeks, I concluded that this doesn't satisfy my needs well. Some of the problems were:
SPICE is BAD. The technology itself is darn good, but it's PITA to use it beyond the simplest usecase. No proper documentation. Configuring this across several different distros was just so painful.
VMs are quite dead, at least for infrastructure and internal stuffs. I ended up having several LXC for most of infrastructure, and applications running inside docker/podman in VMs. There left only few VMs for desktops.
Virtualized workstation is bad, especially when it needs GPU. Both GPU-passthrough nor LXC add more problems than solving anything. Physical workstation is absolutely better in terms of management and workflow.
So, I decided to abandon my Proxmox setup. It was a fun ride, and learned a lot, but the setup itself isn't worth more effort. It solves many problems, but it also made simple things harder. I don't need much tbh.