Cook pork in slow cooker on low for 6 - 8 hours until cooked through but not falling apart. Remove to a plate and let rest for about 15 minutes. Thinly slice; set aside.
To make the noodles, combine peanut butter, lime juice, coconut aminos, rice vinegar, garlic, ginger, crushed red pepper flakes, and coconut milk in a blender and blender until smooth. Toss with the cooled noodles.
To assemble bowls, place noodles on bottom of bowl. Arrange cucumber, carrot, and bell pepper slices around the edges of bowl. Place pork and avocado slices on top. Sprinkle with herbs, chopped peanuts, and crushed red pepper flakes.