If you use Hidden Voices on Gramps and Sawano you get something like what you're asking for :)
Viewing post in PUBLIC RELEASE - v0.21.4 - STUFF AND THINGS! comments
Ah you meant them "reacting" to it right? If that's what you meant, then I did try it (not because I used hidden voices on every single person when I met them, nope). It did surprise me the first time I got them though! :D
How dare you give me this much freedom of trial & error & discovery, in a story-focused game! Curse you, TheArcadean!