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Proxmox is a nice UI and extra utilities on top of KVM for VMs, KVM can be installed on any Linux system.

I'd install Proxmox in a VM and give it a try if you want to see how it goes.

Just for note: Proxmox also can run containers (not Docker) beside VMs.

I tend to use those VE, virtual environment to make distinguish between containers, VMs and lightweight full OS based containers, since the days of using OpenVZ - may be i'll like that naming too.

Xcp-ng is also an option (it's based on Zen)

You can run QEMU/KVM using docker/podman. I made a simple container here for it that lets you use cloud-init: https://github.com/candiddev/shared/tree/main/containers/qem...