For the meatloaf: Preheat the oven to 375 degrees F.
In a heavy skillet, add the oil and heat over medium-high heat. Add the onion, carrot, celery and garlic and cook, stirring often, until the vegetables are soft, about 8 minutes. Set aside until cool enough to handle.
In a large bowl, combine the sauteed vegetables, ground beef, chorizo and green chiles.
In a medium bowl, combine the salt, cumin, black pepper, cayenne and eggs. Add the ketchup and sour cream. Mix well with a fork, then pour it on top of the meat mixture. Sprinkle with the breadcrumbs and mix thoroughly with clean hands.
Put the mixture into a loaf pan. Bake until an instant-read thermometer inserted into the center of the meatloaf registers 160 degrees F, 40 to 45 minutes. Remove from the oven and carefully pour off any accumulated pan juices.
For the salsa-glaze: Heat the oil in a heavy skillet over medium heat. Add the garlic and onion and saute until softened, 3 to 4 minutes. Stir in the tomato puree, sugar, mustard, green chiles and chipotle chile. Bring the mixture to a simmer over medium-low heat. Cook until slightly thickened, 5 to 6 minutes. Season with salt to taste.
Slice the meatloaf and arrange on a platter. Spoon the salsa-glaze over the meatloaf, garnish with fresh cilantro if desired and serve.