The forks on this page are carbon, one inch, and quite nice looking.
They're threadless, but you could ask CarbonCycles if they advocate threading (tube wall must be sufficiently thick and strong). Otherwise, you need to change headset and stem.
There's no such thing as a threaded carbon steerer. And 1" aluminum steerers are inferior to 1" steel ones in my opinion. That's why reputable companies don't produce them.