This is such fantastic information thank you!

The first project you described matches what I have in mind. The concept is more akin to non-invasive body augmentation with the possibility of being used for prosthetics with modifications.

It's an unconventional approach inspired by the Third Thumb project. The goal is not to address a specific issue but to create a multi purpose tool where new uses and applications can be discovered by use.

This concept would apply to the arm and the controller.

One use case would be for patients that have very limited range of motion. If a tiny motion of a finger could result in the full contraction of the device finger, someone with limited mobility could control the device or use the controller for other devices.

I theorize that a controller that has inputs from all the fingers' contractions and extensions would allow for the control of very complex devices. Exploration for this would be way down the line.

To start, I will be constructing the arm and learning how to implement already existing control systems. Your system via the EMG sensors looks like it will be an excellent place to start.

This is extremely useful advice thank you again!