I've attached a picture below, showing the assumed zone, and highlighted in red the section of road-way/kerb-side that could be set aside for Virgin Blue "Premium" drop-off. (Presumably, the more-stingy than me, SACL could extend the awning to this section of road, rip out a section of wall into the T2 Function Room, install some sort of checked-baggage transfer system and, finally, a lift/escalator direct from the lounge to the mezzanine level [at the bottom of the Virgin Blue pier]. Of course, a priority security screening position, would have to be located at the entrance to the Lounge.)
Virgin Blue could create (maybe even without having placed a good scotch on the shelf in their bars) the best "Premium Customer/Ground/Lounge experience in Australia", leap frogging Qantas for ground departure service in Sydney and removing the need to use the main LCC/regional SYD T2 entrance.
It would be like, Corporate Fare (/P.E.) Guests, Gold Frequent Flyers and Lounge Members/Users almost had their own separate priority terminal, very civilized!
OK, I am getting carried away.