There is always the opportunity to hack them, the problem is that it will not be as easy as it used to be, it can represent a problem that will last for a long time and a more professional modder would be needed.
The old games like Reaper Girlfriend, Shisha Lost Souls, After School (This game was updated I dont think will work), Mistery of the murderous dream, there's a long list, but all of those mod games depend on not having updates from Genius Studio Japan Inc