Belay all of that. I managed to get it sorted finally.
On debian with Heroic Games Launcher handling the install, the install extra data location is
.../Home/.local.share/PUNKCAKE Delicieux/ Showgun King - The Final Checkmate
There you will find your mods folder. Throw in your mods (Preferrably renamed [open the info.lua to know the name]) and start the game, then quit
Refresh your mods folder and you'll see a generic mod launcher organizer file to show the name of the mod and the boolean value of it being enabled. Get your order correct and make certain you escape special characters if necessary. For example, I had an apostraphe (') that I had to escape (/') for it to parse the file correctly and not throw an error about needing a closing bracket out of place.
I hope this helps anyone else looking for a solution.
