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Once you've set the notification to vibrate, then vibration is enabled as an event that occurs before any audible tone. However, a quick shortcut is to enable vibrate then use the volume up / down button. Press all the way down = silent (nothing but LED light) one tap volume up one tap = vibrate only. Another tap up and it'll vibrate then play audible tone quietly. Increase volume up, of course, by just pressing volume bar up. This works across the board for any event that has vibrate enabled.
I think it's a LOT easier than going into the app / menu / vibrate / off. Don't overthink it. Just use the volume up and down button.