First, make the sauce by combining the ketchup, grated ginger, grated garlic, apple cider vinegar, soy sauce, and sweetener.
Dice the chicken into 1” pieces and toss with 1/2 tsp kosher salt and 1 tbsp soy sauce. Place chicken into an air fryer basket with a rack inside. Cook at 400 F for 10 minutes tossing halfway through. Set chicken aside onto a plate.
Add 1” diced bell peppers, onions, and ¼ tsp sea salt.
Cook at 400 F for 2 minutes the vegetables will still be crispy.
Remove the rack and allow the vegetables to fall to the bottom. Add the chicken into the vegetables (making sure to leave any liquid that has drained from the chicken behind) as well as the pineapple. Cook at 400 F for 3 minutes until the chicken is browned on the edges.
Add the sauce and toss the mixture well. Serve immediately on top of hot cauliflower rice.