So, I would consider an anarchist meta-discussion to be of the kind of for instance looking at how a certain branch of anarchism would affect for instance political system x associated by political context y.
Maybe that answer more is related to applied anarchism. Let me try again.
Questions for instance regarding what grounds anarchism must surely be an meta-metaphysical discussion; given that the consitution of anarchism is a given. Now, as I see it, there is no actual unified view on anarchism, as there are many different branches.
Come to think about it, I recently stumbled upon the definition that libertarianism and anarchism are put on a par. This must surely be a mistake. I have difficulties envisioning a solution that makes for instance an anarcho-communist and a libertarian share the same view on liberty, freedom, and so forth.
However, the core of anarchism should also be a meta-discussion to have when all 'cards are on the table', that is when a unified view on anarchism has been achieved, if possible. The core should however be possible to extract some other way. Remember the etymology of 'anarchism'. According to this the definition must be considered very broad.
For instance, taking into account an anarchistic conception of time should be one of the more difficult positions to defend, however, maybe such meta-discussions should be possible under the umbrella you are proposing.