I'm originally from Durban. I'll happily launch my kayak off ANY beach in durban. Heck, I'll launch off any beach in KZN.
Launching of the beaches in port Alfred is comparatively simple. But launching out the Kowie mouth - that's a whole different ball game and can be suicidal in a kayak. I know we're not talking kayaks here, but my point is that while beach launching may require a little more effort to get in the water than launching out a river mouth, its usually safer and more predictable.
Looking at the pics, the mouth appears quite wide, but don't be fooled, it's quite easy to cast from one pier to the next. And then you have the sandbanks...
This is not a harboour mouth. The Kowie mouth has claimed more than its fair share of lives and anybody launching and returning here would do well to give it the necessary respect, irrespective of how experienced you are.