Thinking more on this, I interviewed one therapist, who in response to my asking how she could help with my anxiety at appointments, said she would try all sorts of things and gave an example of one person with whom she sat next to and they emailed each other for months until the person could talk to her. They were in the same room and could see each other, but the client couldn't talk so they wrote until she could. She was not for me for other reasons, but this showed she was willing to work with a client who had trouble with talking to her.