Don’t do ferry its a PITA, use the eurostar/tunnel its far quicker and worth the extra money.
I look at this every year and to be honest i’d love to just get on a train, have a beer and rela all the way to the alps. But the reallity is that its expensive (compared to driving) and is far from hassel free.
Every year we drive to the Alps and to be honest i quite enjoy the drive, all part of the holiday.