6 years ago I set out to improve GNU Unifont, and finally after 6 years I have finished. It has MANY special Unicode symbols, including gender ones and plenty of technical ones. I use it as my IDE and terminal fonts on ALL my OSes. Oh and this time I fixed the link.
Also, "UnifontExMono.png" is both its own preview image as well as a proper build of the font for use cases where TTF and BDF are too big, like in character LCDs. I also do extensive documentation of my content so don't hate me.
Here's a link: UnifontEX
Logo:
Also, I'd handle the trans flag sequence in that OS as a one-character (fullwidth) color bar. Also, the environment that would be booted into would be a computing environment, drawn as much as possible in UnifontEX glyphs. A form of super-textmode. But graphics mode would not conflict either. Note that UnifontEX has MANY gender symbols, including ones you would see in the MOGAI community as well as a third flag (U+26FF, the Rumpus Parable agender one). Also, we are dealing with monochrome 16x16 pixel here, so the flags are done in the graphics renderer not the font. I'm literally falling asleep at my keyboard right now and can't think further on this topic, so I will stop here.