From my testing, the "Invert Screen" setting is still on the Developers Option screen, but, just flashes the screen. I have experimented with the Dark Mode on other devices. It needs "DarkMode=true" in the "ReadingSettings" of the config file to turn it on. It works differently to the "Invert Screen" as it is only active when reading. And handle images without inverting them. The Elipsa has a waveform and other changes specifically for this. The waveform won't be on the older devices and won't be created in the future.
I don't use NickelMenu, but, if it has a way to toggle a config file setting, it can probably do it. Otherwise, add the option manually to see how it works.
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