I have sent you a message but
I am on that ferry with a couple of mates so if you keep your eyes peeled for a Black Ducati Streetfighter a KTM 1290 SDR and a BMW XR ....
We are heading to the parador at Fuente De which is more than a couple of hours as we take the nice roads but you are welcome to Tag along if it helps and you wish to - and stop where you like or book the same hotel ( if they have capacity) as it is quite nice
From there we are meandering down into Portugal via the PArador at Cangas de Narcea and again again you are welcome to tag on or not its up to you
As for the ferry at Plymouth as long as you get there before the latest time to check in its fine as you will be waiting around any way as boarding can often be a painful process as bikes dont get much in the way of priority on that route
As for cabin if you have booked one then its all yours and at worst i can see you in the bar where i will allow you to by me a beer