I’d rather eat small portions than “diet-y” recipes. Putting whole wheat flour in sweet baked goods has never worked for me, and why would you bother with soy milk instead of milk when you already have butter and cream cheese?
There are some really good recipes which replace fat with applesauce; sometimes that works. But fake sugars can disagree with some people mentally and physically.
Custards are fairly low fat and can usually have the sugar reduced by as much as 75% IMO, as the milk and egg base is bland and sweet already.
You can put some clementines and strawberries out with your cookies, and some nuts too - not low fat but very healthy fat. Put them out with their shells on and that slows down the eating. Of course you can end up with shells all over.
Meringue cookies - no fat, unless you put some finely chopped nuts in. They might work with Splenda, too.
Any adult who likes coffee without sugar might just like hot chocolate without sugar. Float 2 Tbs (1/8 c) of ice cream in it - sybarism. Milk and cocoa, none of your nasty add-water mixes. Spike it - Kahlua, Amaretto. Or home-made vanilla extract.
Blech. Why would you use Splenda when you could use Stevia? Splenda is not only poison, it's wretched tasting poison. Stevia tastes good and is natural.