I've got a somewhat limited experience with Stevia, so I wanted to run this by Dolores to see if she concurred with me (she uses it more than I do.) Apparently, it's heat stable, so that's not an issue. What I do find (and she agrees here) is that if you use too much Stevia it can taste bitter. Because it would require a substantial quantity to make this recipe (my
handy-dandy source suggests you'd need from 1 1/2 to 2 tablespoons if it's green powder, about 1/4 teaspoon if it's the white Stevia extact powder. Results may vary, depending on the brand and grade of the product used.) we're both concerned you'll end up with a batch of nasty-tasting syrup.
Personally, I don't think I'd do it...