Shouldn't your product be independent of Jupyter? Jupyter is amazing but still seems to have a beta feel to me as often old Jupyter notebooks will not work at all (for lots of reasons).

I love python, hate the limits on google sheets apis, and don't really honestly think VBA is "scummy-crummy" it is just unsupported. Microsoft made a huge mistake discontinuing real Visual Basic, as it honestly could have been where Python is now, instead VB.net is basically dead, and the momentum Microsoft had with wysiwyg code editing is way behind where it was.

Very cool that you are generating code for the Jupyter notebook. What are the practical row limits as I see that as one reason someone might use Pandas instead of Excel?