You can centrally manage more than 72 stations, but the hardware aspect will still be that many per controller. This will require you to log into each controller independently to manually set them up. It’s still a much better solution than using something from Hunter or the like. It is possible using the API to set up and centrally manage multiple controllers through automation to have as many stations as you desire, but that would most likely be a custom software solution.
By the way, I love the OP’s setup. Great job.