Roads are very good in the Scottish Borders, very little traffic and lots of single track tarmac, A708 to Moffat, B6357 towards Kielder Forest, B709 to Samye Ling, Tibetan Centre for a coffee are all very good roads for me on my BMW R1200GSA and should be just as much fun on the Raid.
As for the Raid, when I eventually make it road worthy, there should ample opportunity for off road skills enhancement.