Would love, if someone also did this with other (linux-like-standalone) qubes too…
The way I understand this, is that you build a custom BIOS version for that qube so that in this case Windows can discover the resolutions. To me that means it should also do the trick for other OSes and work with your Linux standalone too. Once you have it working with Windows, it should be easy to apply the same file to a standalone Linux VM and test.