Slice the English cucumbers into 1/8-inch rounds, sprinkle with salt, and let drain for 15-20 minutes.

In a large bowl, combine drained cucumbers, diced crab (or imitation crab), and cubed avocado.

In a separate bowl, whisk together mayonnaise, softened cream cheese (if using), soy sauce, and sesame seeds until creamy.

Pour the dressing over the cucumber, crab, and avocado mixture and gently toss to coat.

Serve immediately, garnished with additional sesame seeds if desired.