Smoky Chicken, Broccoli Rabe and Wild Rice Casserole

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3 tablespoons unsalted butter

1 cup medium-diced onion (about 1 medium onion)

1/2 cup medium-diced celery (about 2 stalks) 

1/4 cup all-purpose flour 

2 1/2 cups chicken stock or low-sodium chicken broth 

2 cups creme fraiche 

2 tablespoons sherry vinegar 

1 tablespoon roasted garlic paste 

1 tablespoon soy sauce 

Meat from 1 large roasted or rotisserie chicken, diced 

3 cups cooked wild rice (not puffed open) 

2 cups chopped broccoli rabe

1 tablespoon rosemary leaves, chopped 

1/2 teaspoon liquid smoke 

1/4 to 1/2 teaspoon red pepper flakes 

8 ounces Swiss cheese, grated 

1/2 cup sliced almonds