Zell to Daun with Bikes

In Sept, 4 seniors staying in Riverview in Zell. We need transport with 4 bikes to Daun to take the bike ride to Bernkastel...then back to Zell. I see 2 options but lack verification that it is possible and cost efficient: RegioRadler Bus Zell-Berkastel then RegioR Bernkastel-Daun with 4 bikes.

OR...bike to Bullay, train Bullay to Cochem. then, RegioRadler Vulkaneifel (RegioLinie 500) Cochem DB to Daun, ZOB

Does this work? Any other options? I read about Mosel river travel by ferry with bikes but see nothing scheduled.