In medium bowl, combine celery, cucumbers, carrots, cooked rice, scallions and shredded chicken.
In another bowl, whisk avocado seed oil, rice vinegar, palm sugar, sesame oil, lime juice, tamari, fish sauce and chili flakes, if desired, until sugar is dissolved. Adjust seasoning with salt and pepper, to taste.
Pour mixture over celery and shredded chicken mixture; toss to mix.
To serve, portion out salad and top with crushed nuts, cilantro sprigs and lime wedges.