The idea is very good, although it looks a little complicated, but I hope you will manage to do it. You need to treat such people with understanding and kindness, because no one knows what will happen to them tomorrow. People with disabilities are socially vulnerable and very often become victims of crime, which is awful... It would be good if each of them was provided by the state with an audible input signal, which would ensure their safety. This is possible in an ideal world, but I really hope that it will be so in the near future.