He is super smart, and well connected in the lawyer community where we live.
He may believe he is super smart but he is also, by the indications you've shared, quite acting-out and disordered. Sure, he's looking for ways to keep you under his thumb and even intimidated, but there's a reality he wants you to forget: You can end the marriage no matter what he says or does. It may be rough at first since pwBPD or other acting-out disorders are prone to overreact with
extinction bursts intended to coerce you into retreat, but walking out the other end of the marriage is truly astounding.
One of our members, livednlearned, was married to a pwBPD who was a lawyer. She not only divorced him despite his obstruction and boasts of legal connections, she also made it clear in court how bad it was, so much so that she got a
gatekeeping order from the court. This meant he made so many errors that the court eventually treated him as a vexatious litigant and required that all his filings had to be vetted first by a judge before he could proceed to file.
Courts are not there to approve or deny divorces. All it takes is for one spouse to decide to file for divorce and it
will happen. If you are determined then it
will happen. The court system is there to - more or less - referee the process.
Of course, you also need to prepare yourself. It won't be simple nor easy. Find an experienced and proactive lawyer. Listen to your lawyer's advice - which will also include not sharing details of your divorce strategy. Expect your spouse to overreact in unexpected ways. Divorce is not a time to show our Nice Guy or Nice Gal or "I must be overly fair and forthcoming" qualities. Also, we have extensive time-tested experience here, with many of us having also gone through divorces. In addition to your lawyer, we here in peer support can also help you avoid the worst of the common pitfalls and traps that can trip us up. We've "done that, experienced that".