I *think* it should be as easy as the vacation reservation holder getting x number of day tickets dropped on their phone the day the cancellation window closes. Maybe Disney wants you to go through a hoop to activate them so they can predict demand, and they probably will give out hard cards if you go to your hotel desk at check in or bring your reservation number to a TL/BB ticket window, but it should be within the realm of possibility to let guests assign the tickets themselves before they get on property.I hope they don’t require you to be checked in first or else you might get an hour or two tops at the water park given how long it takes them to flip a room.