Well... based on my own experience I would have to say you may have to find a therapist who is knowledgeable with regard to gender identity issues & experienced in working with clients who have them if you want to explore this safely. It's certainly possible, I suppose, one could find a therapist who really hasn't had an interest in gender identity concerns previously, & who knows little about them, but who is open to the idea & willing to learn. However my person bias would be to let them learn on somebody else.

Personally I doubt there is a lot you can do to ensure you won't be labelled as confused, difficult or BPD by a therapist who is not knowledgeable regarding gender identity concerns. I suppose one thing a person could, perhaps, do would be to interview prospective therapists prior to signing on with one to see if their level of interest & expertise could be determined. That might help. However, from what you wrote, it sounds as though you've already lined up a new T you'll be seeing in April.

I don't know if this would work, but one idea might be to contact the new T & ask about her / his experience with, & interest in, gender identity issues. Then assuming they're open to the idea, but perhaps not as knowledgeable as one might like, perhaps you might provide them with some reading material on the subject? (I'm not up on what new books are out on the subject of gender identity. The ones I would be familiar with are perhaps a bit dated at this point.) If your new T isn't knowledgeable with regard to gender identity concerns, & resists your efforts to help educate her / him, that may be a cautionary sign.