>>510984584It seems the best approach would be a helmet type device that can be either submissive in the sense that it can receive signals read from the brain or inductive in that it can induce signals in the brain.
It is theoretically possible to induce currents in targeted neurons with magnetic fields. Those currents could be used to induce nerve signals and give write access to the runtime environment of the nervous system including the brain.
Simpler approaches would be devices shaped like collars or bracelets to induce nerve impulses to large motor groups like the legs etc.
The electrical impulses of nerves theoretically could be measured live and interfaced with the machine without penetrating the skin.
This approach would allow simpler product upgrades and using the products on more than one person consecutively. Think interrogation machines.