It seems that when you called _radiant.res.load_mod, you pass it the file path to the manifest’s location from the mods folder. That means you can have a mod manifest located within another mod if the containing mod is unzipped. It will not work, though if the mod is zipped because its not proper a filepath.
Ultimately what I’m trying to do is only override + mixin certain things (armor and weapons) if the player is playing as the mod’s race. So I’m wondering if there’s a way to modify _radiant.res.load_mod’s behavior to be able to read into zipped file or if theres another way to go about this.