1. To prepare pickles, combine first 4 ingredients (through sambal oelek) in a small saucepan. Bring to a boil, stirring until sugar dissolves. Remove from heat. Add carrot, radishes, and onion. Let stand, uncovered, at room temperature 1 hour.
2. Preheat broiler.
3. Place pork between 2 sheets of plastic wrap; pound to 1/8-inch thickness using a meat mallet or small heavy skillet. Sprinkle pork evenly with salt, and place on a broiler pan coated with cooking spray. Broil 5 minutes. Remove from pan.
4. Cut bread in half lengthwise. Hollow out bottom half of bread, leaving a 1/2-inch-thick shell; reserve torn bread for another use. Place bread halves, cut sides up, on a baking sheet. Broil 1 minute or until toasted.
5. Combine mayonnaise and 1 teaspoon sambal oelek in a small bowl. Spread mayonnaise mixture on cut side of bread top. Layer pickled vegetables, pork slices, cucumber, and cilantro evenly on bread bottom. Cover with bread top. Cut sandwich into 4 equal portions.