As Globaliser says, it shouldn't and probably won't make a difference but once you have a full set of cities you can try putting SYD in as the destination for a simple return and use the advanced routing codes box to indicate the route you want for the return, starting with WEL.
In the example you give, HKG in the outbound route, WEL SYD HKG in the inbound.
Last edited by EsherFlyer; Mar 21, 2018 at 8:39 am