I understand, but their default response for "You've done something to hide information from us" isn't going to be "Oh well, we tried. On your way!"
Yeah, they will send you back where you came from and you will be fucked for life.
Exactly. They'll just take you to a computer they control and make you login there. Or there'll be a law that requires an override authority.
If you're referring to a configurable duration: setting an expiration doesn't work either. They'll just detain you for that length of time.
A week? 2? I don't think technology changes are the right approach here, but you wouldn't be setting travel mode for a duration equal to transit time through an airport.