My reaction was to create a 20km training loop. The loop is in the countryside (where my house is) and so all the shoulders of the highway are soft - anything from heavy gravel, to grass, to packed dirt. I decided to do the loop entirely on the shoulders. Thus, "shoulder training."
Seems to work.
I've only got 23 or 24 days to get "up" for this. I had been counting on my latent commuting fitness, but my reaction after watching the video was that that would not be sufficient.
Really not certain what my goals are - in my head they range from ultimate glory to, just finish.
I think something in between, like, don't lose to anyone riding a tandem might be reasonable.
I'd push that to, don't lose to anyone riding a single speed but I truly have my doubts. There are several Olympic class athletes in this thing (that's why ultimate glory really isn't an option outside of my head).