Shred or chop the rotisserie chicken until you have 4 cups of diced cooked chicken; place in a large mixing bowl.
Chop the red bell pepper into roughly 1/2-inch pieces and add to the bowl with the chicken.
Slice the green onion on the diagonal and finely chop the cilantro; add the green onion to the chicken bowl and reserve the cilantro for later.
Cut the avocados into chunks and toss them with about 2 tablespoons fresh lime juice so the pieces are coated; set aside.
In a small bowl whisk together mayonnaise, additional lime juice to taste, and Vege-Sal or salt until smooth; adjust lime or salt as desired.
Toss the chicken, chopped red bell pepper, and sliced green onion with enough dressing to coat the ingredients evenly.
Gently fold the chopped cilantro into the dressed chicken mixture.
Very gently fold in the lime-coated avocado pieces and the Feta cubes so they remain intact.
Chill the salad for a few hours to meld flavors or serve immediately.