JFTR, the topping would probably also work with oil, it might not taste as good, but it’ll be a whole lot healthier.
I’ve never tried this, but why not just put some cinnamon in with the sugar before its mixed (if its not being used only for yeast)?
btw, SDHN, how do you sift the flour when you make it whole wheat? I find that the whole wheat grains are too big for the screen so I end up with white flour. Anyone else have this issue?