I have been diagnosed with BPD and MDD too. I am on Lexapro. I have also taken a small dose of Klonopin at night to help with sleep during extended periods of depression (which give me serious sleep disturbances).

I have never had any problem with dependency or addiction issues on Klonopin, and I didn't need to taper off or anything. But I take a small dose (just 0.25mg or 0.5mg in the evening before bed), and I haven't taken it for longer than several months at a time. And I have never had any chemical dependency issues. Quite the opposite, I'm a big control freak.