Heat oven to 350°F and line a baking sheet with foil.
Toss squash, sausage, oil, ½ tsp salt, ½ tsp pepper, and 2 thyme sprigs. Roast 25 minutes.
Cook bacon in Dutch oven until crisp, then remove with slotted spoon.
Add butter to bacon fat, sauté onion, celery, garlic for 2–3 minutes.
Stir in flour to make a roux, then deglaze with white wine.
Add stock, remaining thyme, salt, pepper, and beans. Simmer 10 minutes.
Blend 3 cups of soup, return to pot for creaminess.
Stir in cream and lemon zest.
Add roasted squash and kale, simmer until kale wilts.
Garnish with bacon and thyme, then serve.
