Could go with the original Vigilante for an Old West setting. In fact, outside of Jonah Hex, that's been largely left untouched for a good while now. Wouldn't be hard to do on the budget as well.
Speaking of a Batwoman show about Kate, how about actually having Batman in one of the shows? Doesn't have to be the main universe, but at least one where he is active. Maybe younger then what he would be, but still. Titans danced around Bruce dressing him, Gotham avoided it until the last episode, and Batwoman did its own thing with Bruce. And honestly, maybe a version like Adam West's wouldn't bad to bring back either.