OP, you do not have to sneak anyone into the lounge. They just walk in with you. No problem. Especially in the evenings when the food offerings have been taken away and all there is are desserts and drinks. The CMs at the AKL club level have a reputation for being very laid back and accommodating. I have done what you want to do...took my friends in for some chatting over glasses of wine. The CM (Dave, I think) even made origami birds for them with scrap paper and talked with them about their stay. Don't sweat it. There are no guards on duty.