With the sorry state of security that is consumer electronics...
you're nuts.
You'd have to completely rework the entire legal liability system with regards to electronic devices and also put real teeth on enforcement. Otherwise... you just have bots/vpns/tunnels/etc on the devices within the geolock.
On the plus side, thanks for using italics instead of allcaps :)
If there is truly such a thing like a troll campaign, no form of geo lock will ever stop them, but most certainly you will stop legitimate users instead.