Yes booking system seems to require hkid. I would suggest to find a private clinic ( many participate in vaccination drive), you should be able to get one from them.
Downside is private ones only have sinovac jab as I know due to storage issues.
Originally Posted by betterisonehope:
Thanks for replying so promptly, I'm here on an employment visa and on the booking website I'm unable to book for the vaccine without entering a HKID. Are you aware whether or not one can simply rock up to the vaccination center and get a shot if there are leftovers from people who didn't turn up, as is possible in some other countries? I'm assuming not given that it seems the booking system requires one to book both shots in advance...