I go to a neurologist-psychologist, but not for gender therapy.
I know that she's way cool about it, so I've gone a few times fully dressed. When I go dressed, I pass a note to the receptionist to ask for Steffi when I'm called it. It hasn't happened, but my plan would be to not respond if I was called by my boy name.
I see an intake nurse first, and I've shared pictures with the doctor, the intake nurse and any of the admin staff who may be interested.