So, to workaround a problem completely of Disney's making which should never have existed, the best advice is for guests to buy a $150+ device? I don't question the soundness of your advice, but that's ludicrous. Many guests - not just international visitors - don't have smartphones. They are a useful tool for a variety of purposes, but buying an expensive device solely to manage your WDW vacation is absurd.
All this to try and manage a hopelessly over-complicated system, providing needless benefits and features that nobody asked for.