I would rather use Jupyter Notebooks, a sort of "excel within python" rather than the converse. And it exists today. I have Carnets running on an ipad, "trusted", with no dependence on Microsoft services.
> Rather than executing the Python code on your local PC, Excel sends it to the cloud, where it is processed in a secure environment managed by Microsoft.
Microsoft is increasingly following the Sun "Sunray" model, IMO. "Azure is the computer."