Have you considered Stevia aka sweet leaf which is plant based? It's safe for diabetic use, and available in powdered (either own its own or combined with erythritol) or liquid form, or you can grow your own from seed. Erythritol also occurs naturally in some fruits, so comes from natural rather than completely chemicial/arificial sources. I believe monkfruit is another natural option, but I've not researched that one.