Thanks to you all for taking the effort to reply. I am no linux expert, but I do understand the approaches of the different answers. I had tried installing Debian 11 and then adding Proxmox 7.2. I was following a website showing what to do, `but first problem was that my Debian install did not include wget command. I managed to install it but during the Proxmox adding many dependency issues were highlighted which I don't have the knowledge to solve. I thought that it would be better to add Proxmox via APT manager but I can't find a guide for that method.
Adding XFCE to Proxmox seems easier, but I don't know where to start.
I am trying to do this because many people have older laptops that they want to use for their kids schooling, and other things, but they all require different OS's and sometimes different hardware setups. Usually virtualbox would be used, but I found on older hardware that the performance loss was just a bit too much. Why not just use Proxmox via a network? Well where the laptop needs to be used a lot of the time there is no network available, or access to the network is restricted.
Any advice on how to get this done, is muchly appreciated.