Hey! I am sorry, but there aren’t many solutions or resources regarding modding. It’s very sad and I wish we had more. I am not sure either, but I am hoping that with UEFN, Unreal will create mod support tools for individual games.
You can either implement a modding solution framework which I have seen one time a few months ago. It basically allows you to extend some functionality into modding. The more likely solution is that you create your own system.
I would have a look at how people added or created mods for Hogwarts Legacy. They didn’t really have any modding tools, but people have been able to create mods for that game still. With the information on how they create mods, it’s perhaps easier to know how you can alleviate the mod creation.
Please let me know if you find something interesting! 