I do enjoy creme fraiche and berries!
This could be the answer to your search for a dessert that keeps your carb cravings in check. Creme fraiche has only about 1 g carb per oz, and blueberries have only about 8 grams of net carbs per half cup. So you could have a pretty large bowl of blueberries and creme fraiche without setting off the alarm bells. And there is so much good saturated fat in creme fraiche that I suspect the MORE you have the better the AS and the more weight you will lose. And why not stir in a little CO while you are at it?
Another great "dessert" is a dessert cheese. There are so many to choose from, this is one way to add variety to low carb. Since you are into French cooking, there are unripended cheeses like Petit Gervais and Petit Suisse, Ricota and Coulommiers; as well as those which are ripened and have soft edible crusts, such as Brie, Camembert, Liederkranz and Poona. All high fat. Or if you like blue cheeses there are Stilton, Gorgonzola, Bleu, Dorset Vinney and Roquefort. Other semihard dessert cheeses are Muenster, Port du Salut, Bel Paese and Gammelost. You can have them with a little port wine or other after dinner liqueur, and even a few grapes or slices of apples. You can spread the cheeses on apple slices as a crunchy alternative to carby-crackers.
These will extinguish many an appetite, and keep the insulin fires in check.
The only problem would be having these "desserts" too soon after eating a main course. Ideally you would wait at least an hour after dinner before having it. However, as a REPLACEMENT for a high carb, sugary dessert, I would wager that even having these with a shortened "window" is far better than the alternative, and as a transitional strategy, might be worth checking out. I think it is best to avoid dessert entirely, but the perfect is the enemy of the good, so it is better to devise transitional strategies than to rigidly insist on rules that are impossible to adhere to from Day One, and which lead to bingeing.
Another thought I had for you, nougat, phoebe and others who seem to have pretty strong carb cravings: what about "spoiling" your dinner appetite by taking a large platnium "appetitzer" 20-30 minutes before eating dinner? Enig and Fallon recommend this approach in "Eat Fat, Lose Fat":
Want a surefire way to escalate weight loss? Twenty minutes before each meal, take some coconut oil! By mealtime, coconut's satiation effect will be in full force, so that you won't feel hungry. You may even feel full before finishing your, meal, so that you eat less and lose weight. The easiest way to take your coconut oil is to make a Coconut infusion: place 1 to 2 tablespoons of softened coconut oil into a mug and add hot water (or hot herbal tea), allowing the oil to melt before drinking....If you weigh over 180 pounds, take 2 tablespoons coconut oil before each meal, for a total of 6 tablespoons each day. (EFLF, p. 110)
Sounds like Enig and Fallon discovered platinum calories back in 2005!