Wow, Paul, that's quite an itinerary...! You haven't really left too much time for birding the Cape Town area. Ideally, you would need a day for the pelagic, a day for birding the Peninsula's various sites, a day for the west coast and a day for doing the Hottentots Holland and Overberg loop. Even then, you haven't covered all the major sites and will be missing things like Protea Canary (a Cape endemic). Ideally, you would also need more time in the Karoo region than just the short stop off you have allowed.
As a suggestion to you, I would possibly omit the Namaqualand/Bushmanland loop up to Brandvlei from this trip. That is a large area to cover with a handful of target species (Red Lark, Sclater's Lark, Stark's Lark, Barlow's Lark, Burchell's Courser, etc) and possibly concentrate spending more time in the Karoo, either around Beaufort West or in the Tanqua karoo north of Ceres (do-able in a long day from Cape Town).
The other days you save from that part of the trip could be put to good use in Kwazulu Natal close to Sani Pass where there are plenty of other targets to get in the grasslands and forests close by e.g. Cape Parrot, Black-rumped Buttonquail, Buff-spotted Flufftail, etc.
Another good site for Meerkats at Kimberley is Benfontein Game Reserve, but they are literally all over and you could encounter them anywhere along your route until you reach the Karoo NP. South of there towards Cape Town, they become increasingly scarcer.
Whatever the case, you will have lots of fun and get to see plenty. November is a good time to be visiting us and you should get to see lots of whales on the pelagic trip (mostly Southern Rights, but probably also Humpbacks and Bryde's and perhaps even some dolphins) and some of the last of the winter visitors like Pintado Petrels should still be around as well before heading back south.
A closer opportunity is Wakkerstroom (you can pass this general area on route from Sani to Joburg) - a grassland area famous for rare larks, Blue Cranes and select korhaans, Meerkats are also reasonably easy.
