If you're keen for a multi-day, check this out.
I did the inaugural one last year. Manageable distances, segment racing (or not at all), great accommodation, good food, rad vibes.
Stilbaai to Stanford. I believe there will be a car drop-off service.
There's also this, but it's a bit pricey for a one-day on public roads (but no different to Swartberg 100 in that respect)