Not sure where you got the idea that there was a restriction on barrel length or a requirement for a scope. I hunted South Africa in 2014 and used 71/2" barrel SRH. I believe the regulations only stipulate that the revolver is designed for hunting and not personal defense. The scope goes towards being designed for hunting but I don't believe its mandatory. (I used a reflex type sight).

However, if I was going in the near future I'd be contacting one of the specialty firearm permit services eg Gracy Travel, Rifle Permits etc and get up to date informed advice.

ps Paying one of these services to process your permits and provide a meet and greet service prevents a lot of problems. Also gets you through SA Police check in a few minutes rather than hours. Best money you can spend.