Maybe you could give this a try-
I have had great luck with using oranges and creating moist heavenly cakes. The link I got it from is at the bottom of the page, and while it calls for sugar, you could substitute with splenda- though I am not sure about honey or maple sugar (experimentation is needed.) I would through in blueberries as well-
Flourless Orange Cake
Yields 1 9-1/2 or 10-inch cake
This recipe was sent to me by my good friend Tina Davis, who lives in Jerusalem. Tina’s a great cook, and a fabulous cake baker. Her recipe calls for a choice of 2 thin-skinned oranges, or 4-5 clementines, 350 g kumquats or 3 lemons. I made the cake the first time using Meyer lemons. It was good, but when I made it with oranges, I thought it was a lot better. It’s heavenly.
2 medium-size, thin-skinned oranges, preferably seedless
1 1/2 cups ground almonds
1 cup sugar
1 1/2 teaspoons baking powder
Scrub the fruit well. Place in a pot, cover with water, bring to a boil, reduce heat to simmer, cover and simmer for 2 hours, checking every once in a while to make sure the water hasn’t boiled off too much. Drain and when cool enough to handle, cut the fruit in half carefully, and remove all of the seeds (otherwise the cake will be bitter).
Preheat the oven to 350 degrees F. Grease and flour, or line with parchment, a 9-1/2- or 10-inch springform pan. Use matzo meal instead of flour if you are baking for Passover.
Put the fruit, skin and all, in a food processor fitted with the steel blade and puree. Measure out 1-1/4 cups.
Beat the eggs with the sugar and baking powder at medium-high speed until thick and lemon-colored. Add the ground almonds and mix well. Mix in the pulped orange at low speed, in two or three additions, beating for 20 seconds after each addition. Pour into the prepared pan.
Bake for 1 hour, until firm and a knife comes out clean. If the top begins to get too brown halfway through, cover loosely with foil.