Change Touch Sound on Samsung Devices
Unfortunately the sound files are placed in /system/media/audio which is out of reach without root. One reason why this is done is to prevent killing camera noise in regions where camera noise is required by the law.

Not being able to root the phone is purely Verizon's fault - they enforced locked bootloaders on almost all their devices. Furthermore, one can probably wait for root to come out for S7E (many users and relatively new - still has some hope), but P905V being a 3-year-old device certainly isn't gonna get anything new in the near future.