Depending on the carrier you use to book, I believe that there is a requirement that Asia rewards from US carriers fly via the Pacific, which will prevent you from redeeming on the AF routing. If you want that you'll have to book it as a RTW. The 60K each way to HKG is the EasyPass price since CO makes very few seats available for normal/discount rewards on that flight. From an availability perspective, the US-NRT-BKK-SGN/HAN route is going to be your best bet, and even then no guarantee. You could also do some strange routing like US-NGO-GUM-HKG using a mix of NW and CO Micronesia to get to HKG, but that will take a long time.

Also, most carries do a very bad job of showing all the routing options online, so you can try to look some of them up using the web (www.nwa.com/jp is a great place to start) but you'll proabably have to call in to get things like the BKK-SGN/HAN flights figured out.

S.