1. There won't be a network post, just a message sent to the bracelets saying "yo come on over."
2. They will not be, just because Surt is still a threat outside. The fear about Thiazi having spies on the inside is less of a concern now.
3. They will still go gray! Since their souls aren't technically part of this world, they'll end up slipping back into it if they lose their bracelets/connections to the gods.