Are you a platinum/diamond medallion, and will you be when you can book next year? One possible problem is that as award seats open up for the outbound, you won't be able to book them until 4 weeks later while you wait for the return flights to become available to book. If there were 3 awards available, it will be very likely that they will disapear by the time 4 weeks rolls around.

If you are a diamond or platinum, then you can just book the outbound as a one way from ORD-HKG. It will cost the same miles as a round trip, there is no half price for one way awards. Then 4 weeks later when you can book the return, if you find something that works you can call and have them add the return on to the itinerary without losing what you already have booked.