I wouldn't worry one bit about the skewer accidentally opening. To my way of thinking all of the fork mounts are about the same so just buy whatever's cheapest. I used to make my own until the price of commercially manufactured ones got so low that I decided it wasn't worth the effort.

When I has my pick up I bought two keyed alike padlocls and ran a cable across the bed of the truck locking each end into a cleat. That's about a 90% security solution but it worked adequately for the 12 years that I owned the truck.