I resolved my issue with the custom menu+Deck Editor. This will cycle through everyone in the party:
Common Event:
If [name]is in Party
Plugin Command
Actor #1
If[name]is in Party
Plugin Command
Actor#2
If[name]is in Party
Plugin Command
Actor#3
Just need to use right mouse button when done selecting cards to go to the next character. It won't choose a character if they're not in the party.
I thought I'd let you know in case anyone else had the same problem with custom menus.