Best of Luck to you. I find that a creator is indelibly linked to their creation, while they are still living (and their beliefs definitely color it long after they are dead). So, while Rowling draws breath, I endeavor to give her neither profit nor advertising. I do absolutely understand the draw that the fandom has, despite the very problematic aspects of the setting - I'm not going to shit on what people enjoy, though I think that acknowledging the problematic is important.
More than anything, I see that there are a lot of extremely creative people in the fandom. This is easy to prove. You just need to look at all of the cosplayers over the years that have made their own costumes from scratch. I hope that some channel that creative energy into making something better and more inclusive (that doesn't fund hate against trans people).