How to change the Default Actor using an Event

[KirascendantAvatar]

I'm making a game with four main characters, and when they enter dungeons that are most relevant to a specific character, I would like an event to give the player the option to change the overworld sprite to the sprite of the actor for that character. Is there a way to do this without editing the script?

This is in RPGMaker XP.

 

[Kes]

Show choices and within each choice do a 'Change Actor Graphic' command?