I would suggest the Button Controller app or even Basic Button Controller (if you're not as comfortable with the Rule-Machine-esque UI of the former). Either make it easy to respond to some button event and perform some actions/automation in response, which is what you want to do here. The "scenes" from the ZEN72 are translated into button events by the Hubitat driver, then you want to turn on the ZEN04 in response, it seems.
However, one hurdle is that Hubitat's built-in driver for the ZEN72 maxes out at double taps (per the Hubitat button capability model that also does). So, you'll need a custom driver to get three (or more) taps. There may be others, but here is one I'm aware of: [DRIVER] Zooz ZEN Switches Advanced (and Dimmers). You'll want to switch to a driver like this if you aren't already using one.
Then, you'll need to figure out what buttons correspond to what real-world actions. In this driver, it looks like 3 taps up should be "button 5 pushed" and three taps down should be "button 6 pushed," but you can watch events or Logs in real time as you manipulate the real device to see for sure.
Good luck!
