Without all the additives? And you still want the mouthfeel of a full cream? Huh, you just want to give me a challenge tonight, eh?
I'm up for it; bring it. But, you will need a stabilizer, else it will fall flat too fast. Good news is that you can use gelatin as the stabilizer.
Take some gelatin, dissolve in water. Take some skim milk. It must be skim, best you can get, meaning the most whey proteins as possible. Milk has two dynamics by which it will form a hydrocolloid (foam), either above 10% fat, or below 3-4% fat. This happens by different mechanisms, end result is similar.
Anyway, take the dissolved gelatin, add it to the milk. Refrigerate if it's too warm. Then whip in a kitchenaid until it forms a stable foam. About the end of the soft peak stage, maybe a little more into early firm peaks. Add in some powdered sugar, vanilla, etc. If the mouthfeel is wrong, whip up a little full-fat cream and fold in the two together, carefully, so you don't collapse it.
Et la voila: low-fat whipped "cream" au linuxboy. C'est la cuisine formidable.
Hearts and kidneys are tinker toys!