Since you’re not using proxmox as an OS install, why not check out Incus? It accomplishes the same goals as proxmox but is easier to use (for me at least). Make sure you install incus’ web ui, makes it ez pz. Incus does the VMs and containers just like proxmox but isn’t focused on clustering 1st but rather machine 1st. It does do clustering, but the default UI is set for your machine to start so it makes more sense to me. The forums are very useful and questions get answered quickly, and there’s an Ubuntu-only fork called LXD which expands the available pool of answers. (For now, almost all commands are the same between Incus and LXD). I run the incus stable release from the Zabbly package repo, I think the long term release doesn’t have the web ui yet (I could be wrong). Never have had a problem. When Debian 13 hits I’ll switch to whatever is included there and should be set.
https://linuxcontainers.org/incus/docs/main/installing/#installing-from-package
I use incus for VMs and LXC containers. I also have Docker on the Debian system. Many types of containers for every purpose!
I installed incus on a Debian system that I encrypted with LUKS. It unlocks after reboots with a USB drive, basically I use it like a yubikey but you could leave it in so the system always reboots no problem. There’s also a network unlock too but I didn’t try to figure that out. Without USB drive or network, you’ll have to enter the encryption key on every reboot.