Thank you for the update. It shouldn't take you more than 2 minutes per phone to power-cycle it. As I mentioned, you do need a data plan in order for the Direct Connect to work properly as it does need data in order to work properly.
If Direct Connect is essential to your business I would consider changing your plan to include data. We definitely don't want to lose you but it's ultimately your decision.
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.