My husband and I went through the same troubles in New Zealand. We changed a couple of therapists and realised nobody is equipped for this. We had to work together (and sometimes against) the current one to make it work. He now specialises in MOMs here in NZ. Unfortunately, he is taking 6 months off. I can ask him for a recommendation though. In the meantime, join FB group on mixed orientation relationship, they run support groups every couple of weeks. Also, feel free to DM me - my husband and I are always happy to jump on a call and support you and share our experiences.
Good luck 💖