I hate to say this, but I think you need to reflect on how you are approaching this whole issue. It is really obvious that this is bothering you more than them, and that you feel they will be "damaged" if someone doesn't immediately manage to solve their disfluency right now. "There is not much hope of a cure" exemplify this very well. The good news is that a lot of kids grow out of stuttering as they age. Some don't. The most important thing you can do in the latter case is support them and understand that they don't need to be cured. Also reassessing your views around the concepts of neurodivergence could be helpful to help you navigate these times and provide the best support to your kids (feeling "desperate" because your kids stutter is probably not a great way to start).