Bring first 4 ingredients to a boil in a medium saucepan. Add rice; cover, reduce heat, and simmer 20 minutes or until liquid is absorbed. Cool slightly (rice will be sticky).
Combine 2 tablespoons water and soy sauce in a small bowl.
Combine 2 tablespoons water and wasabi powder in a small bowl.
Gently spread about 1/4 cup rice mixture over 1 crepe using moist fingertips. Place 2 spinach leaves on lower third of crepe. Arrange 3 shrimp and 2 avocado slices over spinach. Sprinkle with 1/2 teaspoon sesame seeds. Roll up crepe jelly-roll fashion, pressing seam to seal. Cut roll crosswise into 4 slices. Repeat procedure with the remaining crepes, rice mixture, spinach, shrimp, avocado slices, and sesame seeds. Serve with soy sauce mixture and wasabi sauce.