Same reply as I gave you on Facebook, with some added info.
Install Debian and HA Supervised with no other software to the Debian OS and you will have a supported install of HA Supervised.
Install Proxmox and the HA OS as a VM, gives you an image based supported install almost identical to a Pi, but allows you to run other VMs, like Ubuntu or Debian to install other software without effecting HA.
Bad idea, Containerized HA is known to cause problems and no recommended by the Devs.
No.
Keep it simple. Install an OS (Debian or Proxmox) then install HA (OS on Proxmox, Supervised on Debian)