Your best bet will be to drive to Booroomba carpark in the morning and get warm hiking up the hill. 30 mins at a slow pace on a good track and you will be there. Check out the views - purty. Walk south along the main ridge up some easy slabs for a bit of an explore. Then immediately forget about climbing and walk back downhill to the car. Have a cruisey lunch back at the camp then drive up to Orroral ridge with your gear. Wander along and setup a rope wherever you want now that the sun is high in the sky and you can choose whatever aspect you want. Doesn't need to be a Climb to be a climb. (I think you will be wasting your time getting cold trying to setup a toprope to climb at Booroomba)