Consider container liners also. Maersk or Meteranian Shipping Co maybe Evergreen are three
They have some cabins on container vessels south hampton to USA
Did that, called around to several freighter/container ship companies. Apparently, people travel for fun on those ships all the time. Anyway, everything is fully booked and Monday they will contact me to let me know if there are any openings.
I also called RAF Mildenbhall, just to register for space-a travel. I did that because, say, the airspace opens I may be able to jump on a C-17 days before Virgin has me booked.
We shall see . .