The game is not even out...making rules based on speculation for a challenge? It's like saying 'hey guys here's a challenge: we'll go to this forest we've never been before and we're not allowed to bring water and etc etc etc'. You may not find water at all and die. Or you may find it as soon as you enter. In the first case, it's stupid and a waste of time. In the second, it's not a challenge.
In other words: this challenge may not be possible, or it may be trivial. We don't know until the game is out and we see things for ourselves.
Wait the game and them make up challenges for the community.