EMDR can be done remotely. It is not ideal but I have continued to do EMDR with my T since the lock down. Although my T also specialized in DBT and CBT, he required me to to do a separate DBT class to assist with emotional stability. I took classes for a little over 2 years and am now continuing with the graduate class. I do not have BPD but I have gained a lot of skills from the class. My T also adds DBT techniques to sessions and required me to do the diary card each week. I know you have tried meds, but it may be helpful to give it another try. It took awhile for me to find the right combo but I am currently on 3 different meds. Even if you use meds to help with just one of your conditions, it might make it easier to focus on the other issues for awhile.

have you ever considered trying neurofeedback therapy? all those conditions you listed are ones that neurofeedback can help address.

i did neurofeedback with a practitioner while i continued working with my talk T to address my CPTSD/developmental trauma. for me, neurofeedback helped when talk therapy alone failed to address my trauma symptoms. before the neurofeedback, i was usually leaving my talk therapy sessions quite triggered and severely dissociated. i was making very little positive progress over the many years addressing my trauma and the accompanying symptoms, and actually my symptoms were becoming more exasperated, to the point where i was staring to contemplate SU as my only way of ever experiencing any relief from my despair. the neurofeedback helped to calm my anxiety and overall fears and also settled my emotional dysregulation so i could start actually doing the talk therapy with out becoming overly triggered (hyper-aroused with fear). i made significant progress in my healing once i started doing the neurofeedback. thankfully, i experienced significant improvements within the first few weeks of starting...it quite literally saved my life at that desperate time.

Bessel van der Kolk talks about neurofeedback for addressing trauma in his book, 'The Body Keeps the Score'. that is where i first learned about it. some practitioners even offer neurofeedback remotely and that may be an option for you during these covid times.
these sites may be of some help:
ISNR | International Society for Neurofeedback & Research | Neurofeedback Training and Educational Support
FAQ | Sebern Fisher

I have found specialists in therapy especially unhelpful. Honestly, I wish I could send you my T. IMO you need someone that works with you as a person as opposed to working on your labels/diagnoses. But... finding competent T’s that can truly work with a person competently without getting caught up in labels is like finding a unicorn. Just know that their inability to work with you is on them and is truly not about you.

Over the years, I have been diagnosed with many mental illnesses and none of these diagnoses have helped me with my recovery. Imagine if you were seeking a therapist and you didn't have these diagnoses, what would you want them to be like? Is relational working important or is it more useful for you to have a cognitive emphasis? It seems to me that you don't need a therapist who is a specialist in your selection of diagnoses, but rather a therapist who can work with YOU.