Shongweni Dam and Winston Park are probably the most accessible, if you're willing to set up top-ropes with gear then Monteseel has plenty. Krantzkloof ("Kloof Gorge") is currently closed following the floods.
Check out Roger Nattrass' climbers guide to kzn - available at Southern Rock climbing gym (New Germany). There is a (more) up-to-date pdf for Winston Park here (
https://sites.google.com/view/upphucktery) as well as other kzn info.
There's a couple of whatsapp groups around, pm me your number if you'd like to get on them.