I can confirm GM makes OEM black badges (not painted, but black plastic) under part number 85104905 for the CT4 BW. I was thinking to get the 0fx2gv badges, but at $189 for them verses $200 shipped for factory badges, I went with GM. Cadillac's accessory website lists them at $250, but you can find cheaper at other online parts sites.
I already had black V badges I got from ebay (cheap $10 ones, but good quality), but wanted everything to match with the blackwing badge so I replaced them all.
I might do the caulk trick to fill in the blackwing badge at some point - the above examples look really good
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Edit: they come with an AWD badge for some reason.