Not sure if LXCs would help in that regard as I haven't used it for gaming but you can share a GPU between LXC guests and the host. I have an unprivileged LXC running in Proxmox that uses the GPU for transcoding video.

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shepherdjerred 7 hours ago | parent [-]

AFAIK there is no way to share a GPU between a host and multiple VMs without commercial hardware

	▲	EnigmaCurry 4 hours ago \| parent [-]
		Thats the thing, LXC isn't a VM, its a container, so they all share the same kernel. I think its worth a shot, so I may test this.