Oh lord. I think I know what CoCaro's Indian Ocean colony could be named...
Yonderland.
*banjo intensifies*
Also, I'm interested in covering how a bunch of hillbillies react to living in Africa for so long, especially accent-wise.
I know I've been saying this a lot, but I can't overstate how hilarious/awesome I find this.
I feel like Carolinian Africa would be an outpost of cultural reaction (even by Carolinian standards). I also think a hilarious development would either be some sort of Afrikaans-Carolinian monstrosity of a dialect, or if the colonists developed over the top Southern accents (again, even by Carolina standards) as a way to show that they "ain't goin native."
One thing I could see would be a fairly consistent cultural exchange with the Dutch in Suid-Afrika. Yeah the homelands might be on the rocks from time to time based on Yankee mood in the moment but they're both far-flung outposts of white imperialism hip deep in Inferior negros, so the gloves are off from the word go.
I honestly feel like there would be a lot of intermarriage and friendly exchange between Afrikaners/South African Dutch and the Carolinians. They both have deeply Calvinistic Protestant views (Afrikaner Calvinism and Presbyterianism respectively). They're both surrounded by hostile natives (as long as they don't do something exceptionally nasty), reinforcing a fortress mentality and harsh racism. They also likely have very strict patriarchal views (even by WMIT standards) and are obsessed with the right of free white men to acquire property and protect it with lethal force. It's a match made in white supremacist heaven.
In fact, an interesting thing would be for the two cultures to perhaps slowly merge into one bizarre, insane hybrid.
EDIT: Ok, I feel gross for even suggesting this, but what the hell this is WMIT where the star of the show is nutty Fascist Victorian super-Murica. Let's say the Carolinian and Afrikaner colonists get along very well and they decide to go a more genocidal route with the natives. Then, maybe something happens to one or both home countries. You have the setup for Redneck Afrikaner Draka. Which is a sentence I never thought I would type, lol.