Considering it's a roll-on/roll-off ship, they're this close to providing a transatlantic passenger+vehicle ferry service, which would really be fun.
Another contender https://youtu.be/xsFc3pro8Y8
(Also FR based, cultural reason?)
Consider buying a bike in Europe instead - generally cheaper and you can get something more appropriate to the terrain.
This is based on what I learned 30 years ago so this may be out of date now.
That said, a lot of the relevant key components are technically capable of operation on either though doing so in reality can be more complicated.