Thanks a lot to James Fire for the fix. I was having a problem where my local mods were appearing in the launcher, but not appearing in-game when enabled.
If anyone's out there trying this same fix, remember to do it while the launcher is open. If you close the launcher, edit the files, then open the launcher, the launcher will simply overwrite everything you just did.
I'm not normally one to get negative over things like this, but, respectfully, this is stupid. I should not have to manually edit files at run-time every time I want to play this game.