Currently we have to do an Off-market transfer via Automic:
https://automic.com.au/media/forms/Standard%20Transfer%20Form.pdfOnce listed on the HKSE: I am unfamiliar with what will happen, maybe someone has a better understanding? My basic knowledge is they are transferred from the Atomic registry to the nominated registry for the exchange (I think its HKEx). Form that point you would speak with your broker.
Again, i am not 100% in this process tho, sorry. Hopefully someone can shed some more light for you and I both.