Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add 2 garlic cloves; sauté 1 minute. Add 1/4 teaspoon salt, 1/8 teaspoon pepper, tomatoes, and spinach; sauté until moisture evaporates. Remove from heat; stir in cheeses and rind.
Cut a horizontal slit through thickest portion of each pork chop to form a pocket. Stuff about 1/4 cup spinach mixture into each pocket. Sprinkle remaining 1/4 teaspoon salt and remaining 1/8 teaspoon pepper over pork. Arrange pork on the rack of a broiler pan or roasting pan coated with cooking spray; place rack in pan. Combine remaining 2 garlic cloves, juice, mustard, and oregano in a bowl; stir well. Brush half of mustard mixture over pork. Broil 6 minutes; turn pork. Brush remaining mixture over pork; broil 2 minutes or until done.
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