The issue that you have is that there is no one there to bag drop to. When we were there QF didn’t have bay arrangement with another carrier to accept the bags or even print out bag tags.
We were in your position last year. I am afraid we had to wait for check in to open to check bags and get a boarding pass. They do check the BP as you head to security before Immigration.
On a side note. Depending on your status we found the Qatar lounge to be the best. Make sure you go to the...
We have been Diamond for the past few years and now down to platinum and have never received anything other than the bare minimum upgrade. I wish you better luck than we have had.