One thing that's not mentioned in the article is to use Couch Surfing and Warm Showers. Warm Showers especially is amazing, because it is an amazing cycling community and you can borrow anything from small stitching kits to a full-on welding kits to fix bicycles. Full of amazing things and people in almost all euro velo routes.
FlixBus will take bicycle on board on most buses (for 10 euros IIRC), and most trains will too on weekends and off-peak hours.
Overall, it was a fantastic experience and I can't recommend it enough.