Yes, you could but you would have to use 3 SC for the three items vs. 3 snack items for one CS. We wanted to make sure we had enough SC for the trip (and we did) and since we shared a lot of our CS meals I knew we would have plenty of them to use up. If I was paying for the
DDP I probably wouldn't do it as it's not a great value for a CS but since we got it for free it was a different decision. And now that you only get 1 SC per day per person on the QSDP it may make more sense to use a CS to get 3 snacks. It all depends on how your family uses their credits.
Personally, I don't think using any credits for breakfast is a good value if you are paying for the plan. We do eat most of our breakfasts in the room with our own food but as our trip nears the end we always have credits to use up and that's when we will eat a few more CS breakfasts. On our last day (review to come) we had breakfast at WPE. It was very good but again not a good value if you paid for the meal plan.