Careful calling those regimes authoritarian. Hexbears like to attack this point by assigning a slightly different definition to authoritarian and then either (a) claim that all governments are “authoritarian” or (b) blame liberals for using this word to demonize socialist states. I once saw someone cite https://en.prolewiki.org/wiki/Authoritarianism to “prove” that those states are not authoritarian.
Please don’t use serif fonts for UI elements. Imagine the buttons on your file manager being Times New Roman. (eww.) I think what you’re looking for is a monospaced font that’s designed to distinguish O/0, I/1/l, etc.
Plug for one of my favorite fonts: https://www.jetbrains.com/lp/mono/