I had been hoping that someone who had actually mounted a Duo to an AWOL fork would respond to my queries. I posted this question to several different forums and everyone who has kindly responded, responded with conjecture and well meaning opinion. Somewhere out there someone has hands on experience. And if I really want the Duo I may just have to buy one and see if it will fit.
Maybe, maybe not. I believe this was the first year of AWOL production. You have a small population of bike owners to deal with; how many of those installed a front rack? and of those, how many wanted a Duo? and of those, how many frequent these online forums?
I'd guess that Wayne at the Touring Store is as likely as anyone to know if a particular Tubus rack works with a particular frame, and even he won't hear from all his customers. (For instance, a Tara works well with my Randonee, but I expected it to, and didn't call him to tell him it was working well after I installed it.) Hope you'll post with your experience after you've tried it.