You can quite easily walk to the top of the routes at Strubens and set up a top rope, I have seen others do it.
One of the 5's is called \"the easiest sport route in the country/Africa/Southern hemisphere\" and takes 2 draws according to 'Crags of Gauteng\". The first ascent was a solo, and so I don't think that you would need a rope.
When I take newbies to Strubens I start them on the 12 and 13's. Anything lower just doesn't seem worth it.
See some of my climbing videos and other uninteresting stuff here: