IF you go this route remember to pack your old inflator, hose and your old 2nd. Mine got broken by TSA pulling it out of the bag and the liveaboard didn’t have any extra. I had to rent a BC and 2nd for the trip :(
There are some 2nd’s that go inline with your existing inflator on the same hose, just remember to check hose length, mine was too short for me to look to the right.