You are correct, it should be introduced with other reactors, after they have been introduced. And you’re on the right track with the natural version of the sugar.
If you really want to add sugar back in, and everything else is still out (grains, dairy, legumes, etc), then I would do your plan and then come back to the other items after you’ve had some time to evaluate the mental and emotional response you had. Obviously you’re aware of you’re desire, or “non-desire”, for the sugar after you’ve had it.