Actually, I had in mind something very crude based on the gyro on mobile platforms (so not available when playing on pc): the player wiggles the phone (only say ±75deg in yaw, and even less in pitch) and the main character turns his head accordingly in-game. Maybe it should be only active while pressing the wiggle button on screen.
I am not sure the player would be really able to use this feature, it needs some experimentation…