I don't have BPD, but I have done DBT for depression. It's pretty intense when you start (idk, it should be done as group + individual therapy - there's like rules on getting certified to do DBT or so has been my understanding). I really recommend googling Marsha Linehan, her story is pretty powerful. When I did DBT the first time, I would freak out and hide in the hallway. Recently I restarted it to help with PPD (idk, I know the skills, it just helps me feel grounded if that makes sense). Again, very intense resistance inside even though I insisted to my therapist I wanted to do it (he hadn't even brought it up).

Sounds like there are some other really good suggestions though too. Just my 2cents.