Dummy HDMI - Running Bazzite Headless

I have recently installed Bazzite on my Mini PC (7735HS) and I am loving it. Thanks for the amazing work!

Also would like to run the mini PC headless and noticed the system doesn’t boot if the HDMI cable is not connected. So I ended up purchasing an HDMI dummy plug.

After this the PC did boot up but when I connect over Moonlight, I am only presented with 640x480 resolution and unable to see any other options on the Display Settings.

Despite it is not supported on Wayland, I used xrandr to inspect the dummy plug and confirmed it does support higher resolutions (ie max resolution 32767x32767) although I only see 640x480 from the list of options there too.

Any idea how to dig this deeper to understand whether this is a lost cause and I should get another plug or there is a way to make this plug usable? Do I need to attempt to flash an edid? I fiddled with overriding edid but not sure if I done this correctly.

Here is a screenshot of the display settings:

Thanks in advance.