A tool which can combine across different segments would be useful. I do it in Python outside GA.
The python3 bindings are pretty good. I would imagine you could write a data explorer in Electron, and allow it to combine the elements deep in the JSON to derive query statements which applied in the right way, make combined datasets
It's also impossible to combine segments into one GA "dashboard" -So there's a problem there for viewing status of all your trackers, cross-product.