Hey TrueNorthist, welcome to the board.
I'm not sure how big your dogs are, so I can't comment on whether or not this will be enough food for your size dog, but my only concern with this plan would be that the TOTW is supposed to be an already balanced diet including both protein and carbohydrates. If you add rice, oatmeal, and vegetables to the TOTW, you may actually end up giving your dogs a higher percentage of carbs than they need in their diet. Maybe adding an egg or some fresh meat would help, but I don't know enough about the exact dietary requirements to really suggest a recipe. It's just something you might want to consider.
I'm sure someone with more knowledge on this subject will be along soon. We feed TOTW Pacific Stream and our dogs do very well on it. However, we do like giving them a little extra every now and then, such as a boiled egg, some plain meat, etc. My little girl pup goes wild over fruits and veggies too