In a medium pot over medium heat, melt 1 1/2 teaspoons coconut oil. Add the minced ginger, garlic, and habanero and cook, stirring, until fragrant, about 1 minute.
Add the remaining coconut oil for the sauce (from the 2 1/2 teaspoons total), the mango/orange juice, and the coconut aminos. Increase heat to high and bring the mixture to a boil.
Place 1 teaspoon tapioca flour in a small bowl. When the liquid boils, add about 2 teaspoons of the hot liquid to the flour and whisk until smooth to form a slurry.
While stirring constantly, pour the slurry back into the boiling sauce. Boil for 2 minutes, then reduce heat to medium-low and simmer, stirring frequently, until sauce thickens and becomes glossy, about 6–7 minutes. Transfer to a large bowl to cool and thicken further.
Season the cubed chicken with salt and pepper. Place 3 tablespoons tapioca flour into a large resealable bag, add the chicken, seal, and shake until evenly coated.
Heat 1 tablespoon coconut oil in a medium skillet over medium-high heat. Add half the coated chicken in a single layer (do not crowd) and cook until golden and cooked through, about 2–3 minutes per side. Transfer to a paper towel–lined plate and blot excess oil. Repeat with the remaining chicken, adding more oil if needed.
While the chicken cooks, pulse the cauliflower in a food processor until it reaches a rice-like texture.
Heat 2 teaspoons coconut oil in a large skillet over medium-high heat. Add the riced cauliflower and coconut flakes and cook until lightly golden, about 2–3 minutes. Cover, reduce heat to medium, and cook until tender, about 2–4 minutes more.
Add the cooked chicken and mango cubes to the cooled sauce in the large bowl and toss until the chicken and mango are evenly coated.
Divide the coconut cauliflower rice between two plates, top with the sauced chicken and mango, and garnish with chopped cilantro, green onions, and toasted sesame seeds. Serve hot.