Unless you are planning to use this as a weapon, i don't see how you need a bulky otterbox or even a screen protector for this. A simple case would suffice, we are not in 2012 anymore. Gorilla Glass 4 is scratch proof and you need to drop it face-down from some height for the screen to crack.
I work with and around heavy equipment, aggressive chemicals, adhesives and paints not to mention crazy levels of dust, I would lock my phone in an ammo can if I could hear it ring inside, without full armor the phone would be trashed in less than a day. I go through 2 otterbox defenders in the life span of a phone. Never killed a phone wrapped in one.