Microwave rice according to package directions. Transfer to a large bowl, and fluff with a fork. Set aside.

Process mayonnaise, buttermilk, cilantro, chipotle chile, lime juice, sugar, adobo sauce, cumin, and salt in a blender or food processor until smooth.

Gently stir chicken, beans, scallions, and 3/4 cup mayonnaise mixture into rice. Spoon about 1/2 cup chicken mixture into each tortilla. Top each with 1 tablespoon salsa and 1 tablespoon cheese. Serve with additional mayonnaise mixture.