The problem might be getting CAN-HKG space. It looks like there's just one CZ flight on that route and often not two seats in either economy of biz. However, it looks like you can probably get one in economy and one in biz.

For HKG-NRT(stop)-ATL, watch the segment limits. You should be OK HKG-CAN-NRT-ICN-ATL, but if you can't get ICN-ATL non-stop, you're in trouble since you only get four segments each direction.