Engineless. Now that's an interesting concept that I've toyed with for many years, including those early years when Lin and Larry Pardey cruised extensively without an engine.
My interest in manual propulsion for small boats, as primary or alternate means, continues to present day as I have been toying with a few ideas for my Sun Cat.
With a little effort, most of our small trailerable sailboats could be moved in close quarters or dead calm with either rowing oars, single sculling oar, or Yuloh.
However, for various reasons there appear to be very few sailors who are interested in, or inclined to try, potential manual propulsion methods for their boats.
Just food for thought.