Milan, towards Genoa but A7 dogleg to avoid the city, frontier at Ventimiglia. Pierrot’s second route.
Avoids the tunnel toll, and is almost flat, but admittedly more time on Italian toll roads than French ones. Traffic is busy at this time of year, tis true, but midweek it generally keeps flowing ok. Fair bit of holiday traffic on the 7 south of Lyon too, and one caravan rolling can make a big queue whatever route you choose.
Going over MontGenevre is pretty as Pierrot says, but takes time and burns diesel. Assuming there isn’t a weight limit there too…yet. 19 ton signs seem to be growing all over the place now.