Have done this route. 3 of us, off the ferry onto the boring motorway, direct route via Aachen, tried visiting the 'Ring' on the way, but it makes it a huge day, better giving it dedicated time, fantastic experience. We stayed in Holiday Inn in Baden, nice hotel, collected my points on my priority card lol. Nice walk into town, lovely place., Nx day. tackle the B500. Have done it the other way round too, B500 north to Baden then direct to the ferry, sore arse which ever way. Have fun