A 35-year-old woman from Delhi presents with a 4-year history of intermittent foul-smelling ear discharge from the right ear. She denies ear pain or hearing loss. Otoscopy shows a small marginal perforation with scant discharge. Pure tone audiometry is normal. CT temporal bone shows no ossicular erosion or mastoid involvement. The patient is counselled about the risks and opts for surgical repair. Which of the following surgical approaches would be most appropriate?