1) A simple tech solution would be to use a TV not connected to the network, and directly connect the TV to the instructor's device. Or use a personal laptop (not on Liahona network).1)The instructor wirelessly streaming content to a TV, while any user on Liahona, anywhere in the building tries to take over the streaming screen. it does not matter if the TV is wired or wireless. The network wide open.
2) Airprint or IP print garbage to any of the printers in the building.
3) Loudly streaming a football game or memes during a class.
4) I believe the individual is just wanting the attention, positive or negative.
2) As mentioned, disconnect the printers from the network
3) If the individual is as resourceful and determined as you suggest, they can easily find a way to use their cell network, or a friend's hotspot, and stream whatever content they want. And even if network connections were completely removed, this determined individual can simply access media local to his device, and play that.
4) Perhaps the Bishop should sit in the class next to this individual every week. If the ability is removed to capture a TV, or access a printer, then all that's left is for the individual to misbehave in person. And the Bishop's responsibility is outlined clearly in GHB 38.1.1, as referenced earlier.
If the individual is responsive to boundaries, then a tech solution may be sufficient, and perhaps Global Services could provide some help. But if the situation is an individual that truly is dedicated to mischief, then you'll always be chasing a moving target, and it's a bigger issue than just the Liahona network.