Well, there are a few people who do mix barf and kibble. Effectively if you're doing that then there is no need to feed very much in the way of vegetable matter (if any at all) in the barf part of the diet. Kibble is mostly grains, so there would be little need for any additional plant material. So the barf part of the diet could be made up pretty much exclusively of raw meaty bones, offal and a few additions like eggs, fish and dairy products. Nothing to stop you giving fruit as treats though.
The one caution on feeding that way is that you should not actually mix the two foods, but rather feed one meal a day that is kibble, and a second meal that is barf. Reason being that the digestion times of the two foods are vastly different (around 11 hours for kibble versus around 5 hours for raw food) and that can cause some problems. No worries if you feed the two food types as separate meals though.
