Looking here (https://pve.proxmox.com/wiki/Manual:_vm.conf) shows the options for the VM, so a lot of the properties are covered.
I run my current QEMU machine with qemu-system-arm -name "Server name" -kernel ./custom-rpi-arch-kernel -cpu arm1176 -m 256 -M versatiblepb -no-reboot -serial stdio...
Is it really that far out of the scope? I have currently got ArchArm and Debian running on a virtualised RPi under QEMU. And I would also like to leverage Proxmox to manage that. It is effectively the same thing - a collection of managed QEMU machines. The parameters are a little more specific...