Hi there.
I am doing the same as you... going on our cruise and getting married in one of the ports.
With regard to the Welcome bags, I asked the same question with previous DW Knotties and the majority suggested to do exactly what you're doing. Take everything with you and then put the Welcome bags together once you're on board. It makes it easier for transporting.
I have a list of items in my Bio. It has the same things as most other DW Brides, but a few additional items for cruisers like a night light and extension cord....well, not quite an extension cord, but one that has multiple outlets for the cabins., etc....
Hope this helps!!!!!
P.S. I love your "Ticker"... I had the same exact one... and just took it down this past weekend!