It should be possible to fit a air nozzle behind each hammer on a piano, and a valve on each key.
Pneumatic amplification - the hammer would strike with increased power; but with careful rigging of the nozzle, it should be possible to arrange it so that the hammer beats repeatedly against the strings, permitting a vibrato sustain. The valve would control the airflow, which would modify both volume and beat- rate.
If the valve box was fed from a master manifold, with a controling flow reducer, then each keys beat-rate would slow depending on how many other keys were depressed. This would give fast vibrato single notes and slow throbbing chords.
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