Has it ever occurred to you that once you get one of the possible bad endings, you can unlock another one, a new story mode from the villains' point of view?
For example, you have the option to start as Bonner and live your exciting "adventures" with the protagonists, as you will eventually have Arika at your feet you will be able to order her what clothes to wear, I think it would be something that would give more utility to so many outfits.
Of course, this could open the way for new events.
For example, Bonner decides to invite Kurt to have some drinks at the Adventurer's Guild, where they are served by a beautiful, voluptuous bunny girl wearing a mask. Kurt is fascinated by this woman's beauty as he watches her flirt with other people.
At one point Bonner decides to order "The Special Drink", this bunny girl that looks familiar to Kurt takes a seat on Bonner's lap while loading her mouth with beer and then passes it to Bonner from her mouth.
This could become more interesting if we take into account at what moments in history these events occur, it could be divided into 2 events, one part before EV30 and another after it.
More excitement?
Bonner proposes a bet to Kurt, the winner will spend the night with the voluptuous bunny, the one who drinks the most glasses of beer without passing out will be the winner and the loser will pay the bill, Bonner then added "plus the loser will have to watch the winner enjoy his prize."
(I know it's very possible that we'll never see this, but you can dream)