Would this be Thorn's Fauxloff bike?
Does it make sense to get one of these bargains now and then buy a new wheel and rohloff hub at the end of the Year for the trip...
Ian, the basic plan sounds good, and occasionally used Rohloffs become available at jaw-droppingly good prices on Bay Germany.
...keeping the old wheel to change back to for general commuting when I get back.
I don't think it likely you'd change back to the old wheel from the Rohloff once it was fitted and used.
All the best.
Dan. (who thinks once you make the switch to Rohloff, you'll stay there...)
*Wonderful shop pics, much appreciated!