The way I would make this healthier is by decreasing the sugar. I don't think 14 cup sugar is too much to use with 2 cups of milk. But why make a blueberry sauce (and use sugar) when plain blueberries sounds just as good (to me). As for baking it in the oven, I think the cornmeal will sink and you'll have this heavy layer on the bottom. But if you stirred it a few times at the beginning of the baking, maybe not. If baking in the oven I'd bake at 325º for 20-30 minutes (ovens vary, so watch). As for cooking on top of the stove, it will take as long as any 2 cups-milk pudding (think a mix) and this will depend on how high a heat you use. I'd guess at medium heat it will take you 20 minutes. I prefer making my pudding in the microwave since It never scorches or burns and I don't have to stir all the time. Is there a reason you want to avoid cooking in the microwave? Let us know how you did it, if you liked it, and will you make it again?