using proxmox without the web gui is possible but it is expected to be accessed via webgui or term/ssh and the VMs on there accessed via ssh,rdp,vnc,novnc,etc.
Due to it fundamentally being an advanced qemu/kvm/virtio frontend you can use virtmanager to access the VM from a desktop. In this instance try something like i3, awesomewm, bspwm or even xfce (it can be very light weight).
As an ex nvidia and recent amd user on Linux, I'd say wayland isn't ready for gaming. X11 is still great, and wayland is the sand dunes of Linux in that they just move too fast for valve to adequately offer stable support. Also xwayland is really what's running most games, and that is just another layer.
Electron apps are shit and just a fancy chrome window get a real app or just use chrome --app=https://url.tld