I flew HKG with a layover for a few days in January, nonreved there and had a confirmed seat out (purchased ticket after landing in HKG).
I was never questioned about onward travel (US citizen). There were 3 of us who nonreved in without any onward travel tickets until after we arrived.
Also, did not purchase hotel rooms until after we arrive.
Why buy a confirmed seat back to NRT? Between Jetstar , Cathay Pacific you could probably ZED. But, HK Express might have low cost seats. Once you land in HKG talk with ticket counters for load information and if good on the day you want to fly to NRT take a ZED. Quick look online puts Vanilla Air as the lowest costs confirmed seats, all depends on the day you fly.
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