Lekker! I'm planning the same thing, also solo, but from Cape Town side to George. I need to be in Mosselbay for Christmas, so I've worked out a tentative route which will get me there on the 24th.
Day 1 (Sat, 18 Dec): Stellenbosch to Greyton (I've read reports saying Franschhoek pass is very dangerous with no shoulder, so I might start this day on top of the pass)
Day 2: Greyton to Swellendam
Day 3: Swellendam to Riversdale
Day 4: Riversdale to Calitzdorp (or maybe Rooiberg Lodge)
Day 5: Calitzdorp/Rooiberg to Oudshoorn
Day 6: Oudshoorn to George
Day 7: George to Mosselbay
Still need to do some detail planning, but this is the idea. You can download the route from Ride with GPS app and send to your Garmin or navigate on your phone.