Honestly not trying to snark, but as a trained pastry chef shouldn't you have the expertise to test recipes and figure this out?
That said, as an amateur home baker, I've made several varieties of standard cupcakes with lakato monkfruit sweetener baking 1:1 substitute for a diabetic family member that turned out really well. Some people are sensitive to erythritol and chicory root, though, so it wouldn't be my first choice for kids.
I love banana cupcakes with cream cheese frosting; the bananas add a lot of sweetness and moisture to the recipe without the need for a lot of sugar. This recipe is a hit in our family, and you could reduce the added sugar (I would reduce the granulated and brown sugar by equal amounts). You could also adjust the amount of frosting.
https://sallysbakingaddiction.com/banana-cupcakes-with-cinnamon-cream-cheese-frosting/