A meta-productivity system would be using a productivity system to find and explore productivity systems. I don’t think that works by the nature of what a productivity system is. Fundamentally, you’re always trying to be more productive. That is your ultimate goal. Trying out new methods and ways of thinking is beneficial to your future productivity, because you may find something that works better for you, and so you implement it. But you never really lose the “trying out new methods and ways of thinking” part; that’s just necessary for progress.
A meta-productivity system would be using a productivity system to find and explore productivity systems. I don’t think that works by the nature of what a productivity system is. Fundamentally, you’re always trying to be more productive. That is your ultimate goal. Trying out new methods and ways of thinking is beneficial to your future productivity, because you may find something that works better for you, and so you implement it. But you never really lose the “trying out new methods and ways of thinking” part; that’s just necessary for progress.
That’s one way to go meta, another would be to “Change the way you approach, think about, and frame productivity systems” which this is.