As I understand it you’re looking for a true bitmap font (not vectorized like all examples on the site), with 256 or 512 glyphs, and it should be available in the correct file format. Those are quite different concerns from what you’d need for your IDE! Your best bet might actually be to look at this website: https://int10h.org/oldschool-pc-fonts/
Just let me know what it’s called and where I can find it! You’re also welcome to open an issue in the repo: https://github.com/braver/programmingfonts
That would be a massive undertaking. This article explains it well enough. I can’t though, in a practical sense, test all ~100+ mono fonts on the website against their checklist, and that still ignores several other aspects of accessibility. The reader needs to be included in this: what’s accessible to a novice reader impairs advanced readers. And to be sure about anything you need to test with real people. This is a complex and fascinating field, but entirely out of scope of the website. But the site should help you review fonts for accessibility, and hopefully we can make you find the perfect font for your use cases that way.
Fonts featured on the site don’t need to be free. However the license must support embedding on the site, or an agreement has to be made with the author of the font. Sometimes I reach out to an author, or they contact me. So lots more sites could be added, but I don’t typically go out of my way to try to work something out for commercial fonts.