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On Linux, I use keyd[1] and while I understand that keyd itelf could never run on the Mac, I'd love something that could take my keyd conf and make it work (even approximately) on the Mac.

[1]: https://github.com/rvaiya/keyd

Kmonad is cross platform. https://github.com/kmonad/kmonad/

There is also https://github.com/k0kubun/xremap for Linux

It's included in the Dependencies section which unfortunately is at the end

Funny enough, in most cases it's the other way around.