Someone didn't actually ruin a dessert with Splenda. Why have dessert if you aren't going to do it right. Just eat in moderation. If you are diabetic, I know you can plan for dessert. That is why people keep getting fatter, they think substitutes in the answer for over eating.
I am going to try, but use expresso and sugar and I think it will be great. I never thought of using vanilla wafers rather than ladyfingers, but they would have the correct texture and certainly easier to keep on hand.