I stumbled across this thread while looking for a solution to a similar need. For the sake of anyone reading this in the future, I wanted to share another solution that I found. ...from the official Meraki github account... https://github.com/meraki/dashboard-api-python/blob/main/examples/aio_org_wide_clients_v1.py This script iterates through every Org to which your API key has access and through every network in each Org, then it saves a CSV of the clients in each network and finally, compiles all of the client CSVs into one file containing all the clients in all the networks for that organization. I hope this helps!
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