Gen 3 was a walk in the park. We have Classic Silver Metallic (1F7) body colour, and the rims are apparently that as well: I've been in your shoes though, trying to colour match some curb-rashed Tesla rims, indeterminate, dark-grey colour. Googling I found some concensus on forums, went with a Dupli-Color in a most likely contender; it was "close enough".
FWIW, my very dark-grey Dupli-Color (for Tesla 3 rims) is: FORD CX Dark Shadow Grey CAFM 0360 The Dupli-Color pens have an abrasive "nib" at one end (some sort of glass fibre?), that's good for smoothing out small gouges on the rim edges. By no means seamless, but better, unless you're looking at them right up close. Also two wands, a foam one with clear coat, and a nail polish style brush for the color coat. There's small ball bearing in the color coat to help mix it when shook.
For black wheels with minor curb rash or small chips you can touch it up with black nail polish. Easier to apply with the nail polish brush than with a pen.
The Dupli-Color "pens" have a brush for the color coat, similar to a nail polish bottle. The clear coat has a wedge-shaped foam spear at the end. Also has the aforementionioned abrasive tip (some sort of glass fiber), which is quite effective, and very surgical. Really good on rim curb-rash.