Second for Primo Piatto. I only hear the highest of reviews on this place, it is a quick trip on the skyliner from Epcot or HS, and you can check out the Riviera.
I was going to say second for paying for mousedining.com when I realized mousewatchers.com was recommended. Which is better? I used mousedinig and did get reservations.
Out of the choices you listed, I would only want to go to GF café. I would definitely take the time for Toppolinos or would consider brunch in DS at Homecoming or Wine Bar George.
Remember that this will be a different trip where you can easily change things last minute since there really isn’t a grand schedule to adhere to. It’s your chance to flex your liner muscles and know where to pivot to have an awesome day.
HS woodys lunchbox and put MO in early then Docking Bay 7 for lunch (it is well worth it!)
Epcot hopefully Topolinos or DS brunch
MK GF cafe or Kona/captain cooks (but you have already tried tonga toast so you decide) or just snacks to get you through to lunch
AK I would say Boma but I can’t handle buffets right now. My pick is Kusifiri or Isle of Java QS both have egg/sausage biscuits that are very tasty with coffee relaxing by Tree of Life.