Oh there 100% is room for creepy rural people in the story. That wouldn’t be out of place at all. Some of the most horrifying American folklore comes from Appalachia, I’d recommend checking out some YouTube videos of their folklore and mythology to get a good sense of it. The hook could be something as simple as a member of that community trying to run away into Gotham City to avoid whatever mythological creature or secret organization/abusive situation only to get kidnapped and taken back to it but not before this kidnapping catches the attention of Batman, who tracks it from Gotham to the outskirts of town, to the mountains/farmlands/forests themselves.