I know this has been asked before but the withdrawal of the search function does not allow me to look for it.

As part of my DONE4 I will do both CTS and DPS turnarounds. How easy will these be? Is there any way to get the BP for the return legs issued in HKG before departure? Both turnarounds are circa. 75 minutes so I don't have much time to get through Immigration (if I have to) and back through security.