Thanks so much for the ideas!
This is how we worked it through. Beyond lowering his peak, our requirements were to (1) find a breakfast plan that he really enjoyed, (2) make him feel quite full (= not hungry at all) and (3) keep the amount of calories roughly the same as before for his new "menu," His original menu back in September (and before) was about 69g carbs, 19g protein and 8 g fat, for a total of about 425 cals. His new menu, for instance this morning, is 20g carbs, 46g protein, and 17 fat, for a total of 420 cals.
So the calories total is the same as before, the carbs went from 70-> 20, proteins 19-> 46, and fats 8->17, roughly double for the fats.
I would have no problem increasing the fats a bit further and decreasing the protein and/or the carb - I agree it could work better (as long as it is not too high in fat overall, because my son's BG does blow up when that happens - no French fries for the boy, to his great regret, although we do make exceptions...). The main problem of the full Fage is that it adds 100 cals to the breakfast budget (and the boy does not like Greek or unflavored yogurt, to my unending disappointment).
Same issue for eggs vs eggbeaters: food budget problem. I wanted to make sure that his breakfast is satisfying to him in terms of quantity, so I am not sure about swapping for regular eggs, but fewer of them. And I am also nervous about his eating eggs every single day. In my generation we were supposed to eat margerine because it was better for you: I am not quite comfortable believing 100% of what modern science tells us because I am not sure if it will tell us the same thing 20 years from now (I am a scientist/engineer btw).