Seriously,
You're a club member, so absolutely, join in if you wish.
You can ride bitumen all the way to Beacon if you want and then do the 35kms of good farm gravel roads to the rock. There are plenty of alternative farm gravel road choices to get there or going home.
Yes - it will be an overnight camp at the rock.
I'm not sure if people are doing their own route to get there or not but if you want to join in with others, post up some details of your preferred departure time/s & route on this thread.