Enable slide-lock without PIN/password prior to security timeout - PIN/password enforced by enterprise security policy
I've found a workable solution for this problem. I installed Go Locker, which is a custom slide screen lock. Follow its initial (somewhat confusing) instruction to disable unlocking with the home button, and enable Settings -> Visual Setting -> Hide status bar. Then when you press the power button to lock the phone, when you unlock you get the Go Locker screen. The only downside is after your security timeout, you'll have to enter your password/PIN and then slide to unlock with Go Locker.