Im good for driving from my house to munich to be honest.
There is a town in Switzerland i know called Chur, very similar to Arenburg at the Nurburgring but a little busier. There's a nice hotel there, which doesn't cost the earth. Its just as closer than munich, its a great drive. it would be about 8 hours from calais, which im fine with.
What id probably do is set off tuesday evening and arrive in switzerland on wed afternoon, Ready for a relaxing meal and a few beers.
Im fine for driving there in one hit. I not guna take two nights to get to Worthersee. i cant afford the time off work! lol