Here’s the theory:
You should be able to add in custom text fonts using the inspect tab.
But I’m not good at coding, or if players will even be able to see the text, so if you know how to do this stuff or know if it’s not even possible, let me know.
Or if I should move this into Help or add in research
Whenever you right click on something, there’s a little tab that pops up. At the bottom, it says “inspect”. When you click on it, the source code opens up. It’s used a lot to make addons for websites that you can download. I think if you can find where the code is for obtaining the built in fonts, you should be able to add in your own.
Select the font file in the network tab you want to overwrite, right click, and click override. Select the folder on your computer you want to store the overrides in. Then go to that folder and replace the font file there with the one you want (make sure the file name is the same).
Then, when you’re loading into GKC, make sure you open the inspect tab before you open the map, and the custom font will load. Keep in mind this is completely clientside though.
Unfortunately, there isn’t a good solution that doesn’t involve modifying the client heavily, as far as I know. The best and easiest result you can hope for is to recreate the font in-game using blacked-out props. Sorry.