One question, can't a patch be created to unlock that scene and the SP content?
If it exists in the game, it must. For example, loading a save where Otaku-kun achieved his objective a few times, even in this normal version, the buff from his encounters still appears (badly), and okay... maybe the files for his scene isn't there, but... can't it be added to the patch?
From what I understand, the dev long ago stopped trying to wage a war against the redistribution of versions when he saw that it affected more people than was acceptable.
Also, I understand that the panty patch is from a third party... but does it cost the dev a lot to add his own version with darker ones or a different color to avoid problems or at the same time another outfit and thus fix the joke for those who want them with or without stockings?