Greetings!
I come with a simple suggestion.
What if we could open graphics settings and set the screen to be able to utilize color filters found in gpose?
By default it would be set to normal however as an option you can utilize all of the color filters from this menu as well and play the game like this. It would be a saved setting so if you want to change it would need to be manually changed.
I just peaked at the game with bright 1 and bright 4 and it feels like an instant graphics upgrade. The colors feel far more vibrant and the night sky is so pretty!
edit: as for how it interracts with gpose, the gpose color filter would override the one currently set while you're in gpose. So example, you set gpose to bright 2 and you have color filter settings set to bright 4