Over the years I've seen two philosophies about setting up the departure before you get the clearance.
One school of thought is to put the most likely departure in the box then change it later if you get something different. That way mileages, ETA's and fuels can be roughly crosschecked against the flight plan assuming the winds are loaded.
The other idea is to not enter a departure until you are actually cleared and leave a discontinuity as a reminder that something needs to be done.
Also, the HKG departures used to be coded with a departure plus a departure transition. A common trap was to forget to select the transition and heal the discontinuity to an initial point like OCEAN or ENVAR.