Here's an idea that might work. Get yourself a mango router. It's like $20. You power it off a usb battery pack. You can run a VPN on the router. Then connect the router to the school's wifi in repeater mode which will provide the internet connection. Next you set up your own wifi network on the router that the GoPro will connect to. That way the GoPro is running through the VPN on the mango before it gets on the school network. Can't guarantee that will work, but you can give it a try for $20. There are a bunch of YouTube videos that show you how to set it up.
https://www.gl-inet.com/products/gl-mt300n-v2/
https://www.gl-inet.com/products/gl-mt300n-v2/
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