The other point re Paris is that most (all?) of the TGV service to Basel now runs from Gare de Lyon, via the LGV sud-est, Dijon, the LGV Rhône-Rhin, and Mulhouse. So the change in Paris is not as easy as Gare du Nord to Gare de l’Est.
Some of the TGVs from Paris run through to Zürich. But the...