vst~ further specification messages?

Hi all! I'm creating a patch that will switch out MIDI instruments at random through vst~, but I can't think of a way to have Max select the instrument, only open the plug. I attached an image for reference, where, for example, I want to have a chain of messages that can go "plug play_VST_x64" -> "Libraries" -> "EW Hollywood Orchestral Woodwinds Diamond" -> "Alto Flute" -> "03 Effects" -> "AF Key Clicks" and select that instrument.

Thank you!