Rhine to Rhone Bikepacking Route

From Cologne on the river Rhine to Culoz on the river Rhone.Going from the busy city of Cologne, through the southern Eifel national park, then into France and the Vosges mountains. A traverse of some of trails there, then crossing the Doubs river valley and into the Jura mountains. A quick trip into Switzerland, then bank into France and finishing off through the Jura on the Grand Traverse du Jura MTB route and the Rhone valley. Recommended time of year to ride is late spring to late autumn, although it's a very changeable area, so there could easily be late or early snow blocking the passes. Bike recommendations are more about being confident and comfortable off road than anything specific. Gravel and Mtb bikes are more suitable, but a touring bike or CX bike would also be okay. Surfaces vary widely, but it's mostly on the smoother side, and there's not much single-track on the route.