I think something like this (1-bit-color, might be extremely hard to have Doom not look like mush) might also benefit from a local contrast filter (like the cla

I think something like this (1-bit-color, might be extremely hard to have Doom not look like mush) might also benefit from a local contrast filter (like the clarity slider in Photoshop). That filter would increase the visibility of line pairs that may have otherwise been rendered as the same color. Maybe you could then not need as much dithering or multiple checkboxes.