With the pour overs does he just pick out the good stuff? Vital essentials freeze dried comes in pellets that look a lot like kibble. I use them as moderate value treats, but they're also a complete diet so that could be good to try. Just pricey to feed as diet. I use Real Meat Air Dried food as high value treats, and that is also similar to ziwipeak but it uses more spices so it smells more like human jerky. All of these are not cheap though.
I get not wanting to push raw with the oncologist. If she is concerned with bacteria though, I would be concerned whether a dog is fed raw or kibble. If you look at the studies you'll find that both diets result in some potential risks, just different risks like salmonella vs C. diff (I'd rather take salmonella on that one). Dogs get into all sorts of nasty stuff as well. So I'm kind of like