Hmmm most sugarfree sweets have polyols in them, fastest acting laxatives ever!!
I dont often fancy sweets, but one of my most favourite treats is 'Bounty Tots' -taste very much like white chocolate with coconut filling
You will need:
150g Virgin coconut oil
150 Creamed coconut
1/2 - 1 tsp ground vanilla (ebay)
1 spoon Splenda
Place coconut oil and creamed coconut in a bowl, microwave for 30 seconds to melt, stir in vanilla and Splenda, pour into chocolate moulds or small muffin cases (about 1/4 - 1/2 inch thick), place in freezer for 2 minutes - absolutely scrumptious and healthy as well (google health benefits of coconut oil/coconut).
The drawback is that you cant take these goodies with you when you are out and about, they would melt.
PS: you can add chopped nuts or coconut flakes or even a little melted chocolate, this way you might actually enjoy the dark, high cocoa content chocolate, experiment.