Well, let's sum it up: you want a completely different game.Variety is not freedom. My idea was freedom within the context of the story, and the context of this specific story ventures outside the scope of the family, therefore should 1.either not be forced incest or 2. be optional non incest. Majority of the interactable characters are not family members but the game is a family game. The problem for me in this game is that none of my decisions matter because the MC loves someone over the other, just because that someone is a main character, not because I so developed their relationship, why am I given freedom of choice in that case if the result is the same. It makes this look like a kinetic novel in disguse of a visual novel. And regarding looks it only would make the game more appealing to certain people and less appealing to others, it does not solve the problem of the game which is 90% of the choices don't matter.
Seems you don't even want the incest (which is actually the main part of the story), you don't want the three main LIs (you want a side chick to be the main focus). And you don't like the game choices (they do have quite some meaning in the gameplay, it's only not to your liking. Your "kinetic" and "90% doesn't matter" is nonsense). And the "adding freedom" would be actually a complete game rewrite and adding multiple game routes. Sorry to tell you, but I'm pretty sure that will not happen.
It's imo time for you to look for a game you like, not force an existing one to get changed to it. Good luck.