Welcome Stilltryin: I'm sorry for what you are going through with your wife. Would you have wanted to hear about the BPD diagnosis earlier?
I'm not much of a reader, but have started through it and found that I am not alone,
Many books are available as audio books. That could be an option for further reading and learning.
Do I need to talk with the psychiatrist separately and share with him the counselors opinion of BPD or just hope that it doesn't take him another 7 years to figure it out?
Is part of the reason for the psychiatrist visit to get a prescription for some meds? Typically, psychiatrist visits are short, compared to visits with a psychologist. I'm thinking there is value in having a private discussion and advising the psychiatrist that a therapist thought your wife has BPD. Perhaps you can make a phone call and have a short private discussion with the psychiatrist before the appt. It would be better than mentioning it in a joint session, or waiting for your wife to admit to the diagnosis. I'm thinking that some people with BPD could hide their true nature, during short visits, for an extended length of time. It's hard to treat someone, if the truth is hidden.
Best wishes.