Hi jags!
Looking at the upside, it's nice to tailor the Raleigh more to your needs, and so the investment isn't wasted even if you were to get an Audax later.
Have you considered a used Audax frame or complete bike? Some really nice examples appear occasionally at prices lower than new.
I'm guessing your buyer is having the time of his life on the Sherpa and planning his travels. What a wonderful lot of gear to go with!
Best,
Dan.