Put the crab in a medium bowl, and add the bell pepper, shallot, orange zest, grated radish, celery greens, salt, and pepper. Combine the mayonnaise and heavy cream in a small bowl. Add the dressing to the crab and mix well. Using a rounded spoonful, mound the crab salad onto the root end of the endive and fill the leaves half the length of the endive. Arrange the stuffed endive on a platter and garnish with chopped parsley or chives.