For an easier return route, one could head north to join the Danube, follow its course up river until the Rhine Main Danube Canal and then the Main and Rhine before heading off to Belgium around Cologne. This would be a relatively flat route.
@cliveo started
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For an easier return route, one could head north to join the Danube, follow its course up river until the Rhine Main Danube Canal and then the Main and Rhine before heading off to Belgium around Cologne. This would be a relatively flat route.