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Maybe driving an acoustic guitar like a speaker? (The more interesting way that I haven't seen done would be to do it via conductive or ferromagnetic strings. Vibrating the body could still be interesting on its own, because you ~won't be able to excite some modes from some locations.)
@robryk Funny you should mention it, this is one of my lockdown projects! (Ideally I'd want to zoom in to see the strings resonate)
https://www.youtube.com/watch?v=Ea3YssF50Ps