Hmm... can your daughters pull the luggage off the belt and put it onto a cart? After that they would not need to touch the luggage until it reaches the cabin...
https://www.youtube.com/watch?v=PiF-xQnqARE
https://www.youtube.com/watch?v=PiF-xQnqARE
- Taxi driver can grab luggage on cart and load into his cab.
- Once the cab reaches the terminal, the cruise staff pulls the case from the taxi and loads the luggage onto ship.