I see the issue, hopefully you come up with a solution you are happy with. For now, I’ll snag this version too 😁
FYI, there’s another NSFW game here on itch that has DLC support on Android. It’s a Ren’Py game and it creates a dedicated directory inside the main storage (where the downloads directory and others are). The user then can copy DLCs there to enable them. Dunno how applicable/simple that is in your case though. Just something to consider.
Edit: Actually it’s in the documents directory, not root.