high Stephen, which ferry crossing are you doing?as this could make the choice of routes differ.
In reality and working backwards,your route into Italy should involve entering Italy from the top[Switzerland A2]This is the shortest,and cheapest route,alas all routes will mean some type of hill climb. once in Italy leave the m/way after the second short tunnel, as this takes you around como rather than through it.
This route becomes the SS342,you are heading towards lecco,at the junction with the SS36 you get on that road it takes you through lecco up the side of the lake to sondrio.
From France there are numerous routes you could take, i suggest any route you fancy that scouts across the top of France be it via Luxembourg or across to Riems as a good choice, you need to decide tolls or less tolls. good luck