customize_preview_init: listening for any changes from Customizer preview area

Yes. You can bind to the change event on the entire Setting collection (wp.customize) as follows:

wp.customize.bind( 'change', function ( setting ) {
    if ( 0 === setting.id.indexOf( 'my_settings[' ) ) {
        doSomethingWithSettingValue( setting.get() );
    }
});

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