Bumblebee with HDMI on Nvidia - Make usable both with/without connected monitor

I use an Asus laptop with Optimus. The VGA output is wired to the Intel card, while the HDMI output is wired to the Nvidia card.

I'm not using PRIME or nouveau, but prefer a bumblebee setup (the only real use of my Nvidia card is to run games on steam, really). PRIME gave really weird bugs with regards to mouse cursor screen-lock etc, and nouveau makes my nvidia's 'performance' on par with that of my Intel card, which defeats the purpose.

On bumblebee, I can get the exteal HDMI monitor working by using intel-virtual-output. the monitor then appears without issue in xrandr and can be used as a clone/extended screen using the normal xrandr tools. However this requires that I comment out the "UseDisplayDevice" option in /etc/bumblebee/xorg.conf.nvidia

The problem with doing that is that when I don't have a monitor connected to HDMI (whenever I'm away from the office), primusrun will complain that no monitor is connected, and I have to have the following uncommented line

Option "UseDisplayDevice" "none"

in the device section of /etc/bumblebee/xorg.conf.nvidia

This setup is the result of tweaking and googling for a while, and the only 'problem' with it is the repeated need to edit the nvidia xorg.conf depending on whether I have a monitor or not. Is there any way to get around that?

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