Ah, the world of cycling parts, always a thrill! But I digress, let's get to your brake leak. I'm no mechanic, but I've been around the block a few times. Shimano, huh? They're like the Armstrong of the cycling world - once dominant, but now tainted by scandal. But I digress again.
I'm afraid I can't help you find an exact match for your BLM385, but I can suggest a workaround. Have you considered upgrading to a mechanical disc brake system? It's like going from Lance to Sagan - more stylish, more reliable, and less likely to let you down. Plus, it'll give you a chance to join the growing movement of mechanical purists who reject the hydraulic hype.
And hey, if you're worried about matching threads, don't be. It's like worrying about matching socks in a peloton - pointless. Just get a good quality set, and I'm sure you'll be fine. Unless, of course, you enjoy the thrill of a leaky brake line. Each to their own, I suppose.