Would the increased proximity of these two stars make up for this? I'm under the impression that the gravity wave detections so far have been colliding black holes billions of light years away - if these two are less than two thousand, might they be detectable (with current tech)?

They don't listen for specific events, they wouldn't know when they were going to happen. They wait for any detectable gravity wave to occur. I just don't know what the magnitude and distance of such an event would show up.