Prepare the crepes: In a bowl, combine flour, sugar, salt, eggs and melted butter. Stir until smooth. Add milk and mix well. Strain.
Heat a 7-inch crepe pan or non-stick omelet pan and melt 1 teaspoon butter over moderate heat. Pour in 2 or 3 tablespoons of batter. Cook the crepe until it is golden brown on the bottom; then flip it, using a spatula. Remove when golden brown on both sides. Continue until all the batter is used.
In a food processor, combine sugar and lemon zest and process until lemon zest is minced. Add the cheese, butter, 1 egg, and a pinch of salt. Process until cheese is smooth. With the motor running, add the remaining eggs through the feed tube, one at a time. Add creme fraiche and process just to combine. Transfer to a bowl and stir in raisins and vanilla. Refrigerate for 2 hours or overnight.
Make the glaze: Whisk together eggs and sugar. Whisk in heavy cream. Reserve.
Preheat oven to 375 degrees F. Butter individual gratin dishes. Place about 2 tablespoons of filling in each crepe and roll to enclose. Arrange two or three crepes in each gratin dish.
Pour glaze over crepes and bake until lightly browned, about 30 minutes.
Serve in gratin dishes directly from the oven. Top with apricot marmalade.