As an update to my forcibly removed tag, contacted Qantas by phone and was told I have to take bag to airport for them to assess the damage (already repaired with needle, thread and palm). They then transferred me to the appropriate person in charge of tags which turned out to be Jetstar and, after two minutes of "that is not a valid booking reference", "yes it is" to and fro and was then transferred back to Qantas to hang forever in a holding pattern.
Hung up, waited ten minutes and called back to a lovely lady from overseas(?) who provided the information that replacement tags can be ordered online through my account/profile update.
Will see what happens now.