Remove rind and seed from cantaloupe; chop. Place 2 cups chopped melon in a food processor or blender; add orange juice and process or blend until smooth. Transfer 1/2 cup of the pureed melon to a small mixing bowl; add hoisin sauce. Strain remaining puree and reserve the juice, discarding solids.
Sprinkle pork lightly with salt and pepper; brush generously with the hoisin mixture. Heat oil in a 12-inch skillet. Add chops to skillet; cook for 3 to 4 minutes on each side or until well browned and only a trace of pink remains (160 degrees F).
Meanwhile, combine remaining chopped melon, strained juice, and green onions. Remove chops from skillet; add remaining hoisin mixture to skillet. Cook and stir until heated through. Spoon onto serving plates. Top each with a chop. Add melon mixture to skillet to warm slightly; serve over chops. If desired, serve with shredded Napa cabbage.