Custom resolution and aspect ratio with windowed mode

Is it possible to somehow customize the windowed mode windows size and aspect ration? I have 65" 4k monitor and like to play the game with 32:9 aspect ratio in windowed mode with 3840x1080 resolution. I can manually set that with the appsettings file. When starting the game it starts with my custom resolution but it will fall back to my 16:9 aspect ratio after one sec, so seems like the game is forcing the windows aspect ratio to the native screen aspect ration. Any trick to fix this?
 
Setting an arbitrary resolution in DisplaySettings.xml seems to result in the game falling back to the nearest listed resolution.

The most straighforward workaround for this would be to add a custom display resolution with either the video card's driver control panel, or a third party tool like CRU.
 
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