I have thus far only found one who is useful and with whom I am safe discussing it. And I have interviewed a lot of them these past three years. The two I saw earlier in my life were awful at handling it - so I just quit telling them about it.
There are not that many who are good at handling it in my experience, regardless of whether they believe they have been trained in it or not. Some "training" focusses on crap no harm contracts like the one OP is dealing with. (I am not bpd and I don't have a psychiatrist nor have I ever been dangerously hurt by si - my viewpoint is just from my experience with it).