my personal route would be(depending on the time you have got)
Leave calais and head for Lille, then onto Namur, follow sighn to achen, turn right past SPA, then Trier, from there Scoot around Luxembourg,down to colmar,cross the Boarder at Basel (swiss) run through to Belinzona (st gottard) then either take st Moritz,Cortina or chiaso Milan!
all great routes ! some fast roads/motorways to get some mile munching done and then
TWISTIES
Mav