You record the sound the way it should be heard — your mouth, your voice. That clip is what the patient copies at home, as often as needed. The patient records each attempt, and every take comes back to you.
Record the target pronunciation yourself. The patient sees the mouth and hears the sound on the same card — that is what the patient copies and tries to reproduce, without you having to be in the room.
The patient records the attempts and sends them. They stack up on the same card, so you can compare one take with the next and see whether the sound is moving — or decide the approach needs changing.

Record it once and it guides every practice at home. For speech pathology, and for the rest of the clinic.