An exemplary system includes 1) an electro-acoustic stimulation (“EAS”) sound processor located external to a patient, 2) a cochlear implant communicatively coupled to the EAS sound processor and implanted within the patient, 3) an electrode array communicatively coupled to the cochlear implant and located within a cochlea of the patient, and 4) a receiver communicatively coupled to the EAS sound processor and configured to be in communication with an ear of the patient. The EAS sound processor operates in accordance with an acoustic-only mode during a post-implant time period and detects audio content presented to the patient, directs the receiver to apply acoustic stimulation, and prevents the cochlear implant from applying electrical stimulation representative of audio content presented to the patient during the post-implant time period. Corresponding systems and methods are also disclosed.