I assume everywhere where living conditions are hard you find men and women sewing.
To improve their standard of living. Why not make use of the engineering skills here and over there. What I mean is that. If you have a low power sewing machine. The people could increase their production. Given the shortage of electricity.
So the idea is to provide engineer help.
I cant figure out a cheap solar ready construction that would solve this. But maybe a 3D Printer Sewing Machine for patterns could generate some interest.
Further I wonder if there exists more sewing machine innovations. Maybe you can have two needles where one is tilted. So that you only need a mechanism above the fabric.
// Per Lindholm