Assuming I can just pull out the existing outlet in the kitchen cabinet and replace it with one of the newer models that also have 2 USB ports built in?
Yes, it should be straightforward to do that. A lower tech option is to buy a 2 USB adapter that plugs into the cigarette lighter socket if you don't also need the cig lighter socket simultaneously. Amazon has them.
David
That's a great idea to start, plus previous owner added those to the corner 12v rca inputs. Looking at that main outlet again, I do feel like I should switch out to gfci since right below the sink.