As a bit of an aside, I really like the idea of trying to design things with the constraint of it having to be able to run off a hand-crank.
I feel like it is not only an interesting engineering challenge but one that might lead to a more efficient and sustainable framing.
In a similar vein, the solar-powered website. [0]
[0] https://solar.lowtechmagazine.com/about/the-solar-website/
It's not more sustainable though. It takes more energy to grow the food to get the calories to metabolize to turn the crank than it would to run an electric motor or a engine to do the same work.
I would love a crank-powered router. Would be a good way to curb internet addiction!
Or we could... hear me out... build more power plants. The de-growth stuff is pretty evil when you take it to it's logical conclusion of population control.