I hope you contacted Brompton about this tour. I'm sure they might sponsor you since a book involved could very well generate thousands in sales. In fact, you might want to work an arrangement acting as a rolling dealership. There will be alot of people who will become interested in Bromptons because your riding them. Just ideas of course.

I still think you should make more use of the rear rack and not put too much weight on the seat post. Good luck.