Sorry, maybe I'm not understanding something, but why should the lounge call boarding early if they aren't boarding the flight? They call it when it has started boarding, they won't make pre-boarding calls.
It is your responsibility to get to the gate and use the boarding whenever you feel like it. If you want to board early, then get to the gate early?
In no way, will they ever call the flight in the lounge and then hold off boarding until the lounge passengers arrive at the gate.
The domestic lounges are already filled with boarding calls and final boarding calls, adding a pre-boarding call is just making the lounges more of a zoo with the noise. Still think all QF lounges should be silent.