Yeah, Cathay would require a deviation bank - my bad. Not sure about Singapore (maybe a Subic guy could enlighten us), but a United seat in the back should be available. Remember, I said it was doable - didn't say it would be easy.
And Albie has a good point about Reserve and Guard security clearances. Living in China or Hong Kong (which is now technically part of China) could prove to be very problematic for those guys with Secret and above clearances.