Take the train from Venice to Switzerland. It's the best advice I could give you.
I'm afraid you're a little late - I just got back a few days ago! We did indeed take the train from Venice to Switzerland, though through Milan and Domodossola instead of the route you mention. Some quite nice scenery on that route, too, once you get into the Italian lake country and beyond.
For those of you waiting for pictures, it typically takes me about two months to finish culling & processing the photos and then post them to my web site; I'll drop a note here when I do. One preview: There will be much snow! We actually had snow one day in Venice (though not cold enough to stick), which a local told us only happens about once every five years. Snowstorm for a couple of days in Switzerland, too, which eliminated any views other than of nearby snowy trees, but we had a couple of good days there before the storm hit.
Lisa