You are correct about Koishi, and it is true that applying a different band-aid still won't fix the main problem. In that vein, we should be working toward fixing the populace's fear and hatred of her, if not satori as a species. This is why I want to put in a good word for her in Hatate's article.
Utsuho still considers Koishi Aunt Koishi; at this point, she doesn't resent Koishi for anything. She wants Koishi back, because she's family. Everyone in the Komeiji family wants Koishi back, because she's family. If we need tangible evidence of that, Satori has expressed a wish to have Koishi over for dinner.
I think Satori is happy with things the way they are, if for no other reason than because she didn't take the same eye-closing path Koishi did. I imagine she spends her time alone/with pets because it's so practical - imagine if you had innate mind-reading abilities and you wandered into a group of fairies, for instance. It's amazing enough she can wander around a city full of inebriated muscleheads without her head liquefying.
Koishi's role in Utsuho Quest was very brief - she appeared near the end, after KanaSuwa got KTFOd, and she and Utsuho had a very short fight before she ragequit.