Found: Acros The Clamp Adjustable Headset
Acros, the company which brought hydraulic shifting to the market, has a half dozen neat products tucked away on their website. The Acros Clamp, is their take on a integrated headset (or headset upper), designed specifically for carbon steerers. Essentially, the product is an adjustable spacer which eliminates the need for a starnut or expander wedge. It utilizes a ramping system, adjusted via a setscrew, to put pressure against the stem and preload the bearings. They are hand built in Germany and are come standard with stainless steel ACB bearings but ceramic bearings are also available (at a premium).
Weight for the complete headset is 70 grams and will set you back aprx $105 for the stainless bearings, and aprx $200 for the ceramics. To pricey for this conversation piece? The upper alone, at 54 grams, retails for $65. Both are available in either red or black.