Dream whip has 20 c. I think there's 1 envelope in that recipe, so the rest probably comes from the cherry topping. As far as I can remember the ingredients are the whipped DW, and a block of cream cheese. The (cherry pie filling topping would contribute (1/3 cup) 22 carbs.
For my Bday, I may do that. If someone else will do the cake.

Otherwise, cream cheese softened with a bit of HWC and topped w/the cherry pie filling.