Finally found a decent blueprint. I'm going to make a small exploration-type event based on simple blueprint and matrix.
Ideally there should be an option to change party members and formation during the event without actual access to MC screen. And not to include any hired character into the team, like usual, but to select only from the characters that you found during this event. Or, generally speaking, to select team from a freely changable pool of characters.
It could be easily but clumsily done via usual menus, when we just ask how the party should be built step by step. But if you can code something better closer to the release, it will look better.