Change all connected networks to private instead of public?

Is there a way I can change all connected networks to private instead of public with a click-able script? The problem was that a User was connected to an open network using a VPN which then also connected showing Public. With both as Public, they could not map to a network resource. I fixed it using the "go to home-groups and change network settings, etc." But surely there is a way it could be handled with a simple script to edit same? End result was the VPN showed private while the open WiFi he connected to still showed public but he could access the server now.

Why would you? You are opening up a huge can of worms, letting some unknown Public network to allow others access to your computer.

If they cannot use VPN on Public networks. It is most likely those networks are locked down to keep people from using VPN, etc on them.