Slice the English cucumbers into 1/8-inch thick rounds using a mandolin or sharp knife. Sprinkle lightly with salt and let drain for 15-20 minutes.

In a large mixing bowl, combine the drained cucumber slices, diced crab (or imitation crab), and cubed avocado. Gently stir to combine.

In a separate bowl, whisk together mayonnaise, cream cheese, soy sauce, and sesame seeds until smooth. Adjust seasoning to taste.

Pour the dressing over the cucumber mixture and gently toss to coat all ingredients.

Serve immediately, garnished with additional sesame seeds if desired.