Matt - you are a good friend to pick up the balance for your friends. Good luck, and let us know how it turns out. I think Bill A is correct, Carnival would probably be willing to work with you but you may have to climb the ranks a little bit.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014, 2016
Star Clippers: Royal Clipper 2015