Interesting set-up, Matt. I spoke with some German cyclists this past Sept., on my Amsterdam-Vienna ride, and they all used these bars. I asked how they handled headwinds, and the preferred option was to lay their forearms across the lower bar, just inboard of the curve, grabbing the forward/upper bar with their hands. (i.e., a variant of the triathlon riders' V-shaped resting posture, without the elbow rests.) In our conversations, it wasn't clear to me whether they used the final, innermost curve -- I reckon you could cut those off, and still get the benefit of their lowered position, and mount a handlebar bag if you wanted to.
Cheers, J.