Hi Rainbow, schema therapy is excellent for BPD if you can find a practitioner who is trained to do it. It's definitely more palatable than DBT is for most people with BPD because DBT is often perceived as too clinical and harsh for people with BPD. However, according to the schema therapy practitioner's guide they sometimes use DBT later on after doing schema therapy if the patient really needs the more extensive skills training that DBT offers.
I also noticed the similarities with IFS and that's one of the reasons why I thought you might relate to this information. I wish I could link you to the BPD chapter of the schema therapy practitioner's guide because it's very detailed and even if your T doesn't actually do schema therapy you could benefit from the strategies that are used. I have the practitioner's guide downloaded on a different computer but that computer no longer has internet access so I don't know how I could get that chapter to you.