I'm curious if there's more than one way to achieve this.
Creating a single VM, with vm within vm (performance hit would be negligible for the orchestration work of agents), and it might offer some alternatives without having to customize Proxmox as much?
This is what I do for a few projects. One beefy (Debian) VM with the CPU type set to "host" (or something like that) to allow for nested virtualization. Running Firecracker inside that VM.
Just be careful with the virtualized file systems to not create write amplification issues.
Creating a single VM, with vm within vm (performance hit would be negligible for the orchestration work of agents), and it might offer some alternatives without having to customize Proxmox as much?