While it would be nice to have this functionality available through one setting change, we are not without options in iOS.
You choose the time an alarm is set to alert you. You can also schedule DND to turn on and off. Why not schedule DND to turn off at the exact same time you schedule your alarm to wake you?
I current set alarms to wake me, and I also schedule DND to turn on and off everyday at the times I go to sleep and wake up. Works great for me.