Functional Umaro Patch

Does anyone know how to add Umaro to the list of characters who are unequipped in the Airship?

Both NPC use the $CC3510 event. You need to add event code for Umaro. The two things to change are the $CC351E and $CC359D branches. This is pretty straight forward, use the B2 command to call some code in free space of the ROM, add in that free space the code you removed to make room for the B2 command and add your Umaro code after this. If you look at the event dump and have a hex editor opened it's basically adding an entry for Umaro like there are already 13 for other characters.