They should borrow from block chain. Let 2 people agree to defend each others land and let people sign one house at a time. The larger it gets the more people with consensus. That should get it big enough until enough people can contribute a small amount to register and a central registry can be created.
Really? That's your answer for people in Haiti with no electricity? Borrow from the blockchain? They live on less than a dollar a day and have no access to computers, let alone internet.