If I remember correctly, Beyond the Book Report has a video component you can buy so that you do not have to do the teaching. I wish I had used it before to give more info, but I'm sure there are reviews out there to read. I just remember liking how it went through a number of different types of writing, and I liked the idea of not having to think of it all myself. She has a video on her website that walks you briefly through the program.
I think an online class could be a good option. I needed something for writing this year that wasn't directed by me entirely, but couldn't swing the cost of an online class, so we did IEW. I do think it's entirely possibly to use it without sticking rigidly to the formula. My daughter enjoyed the videos. I liked not teaching a subject. We will do continuation course b next year, then decide where to go from there.
Sometimes I think there is no perfect choice. Whatever you pick will have good and bad, and that's okay. But if you are recognizing that you may be a bit burned out, doing something that isn't completely on you may be a good thing. Even if it's not as good as what you could do yourself. At least it will get done, give you a breather, and still help your kids move forward in writing.