How to implement keyboard key remapping at the controller level?

Question

Keyboard

There is a USB keyboard.
You need to change the layout of the keys.
It is supposed to use some external controller that will be stuck between the keyboard and the computer and send other scan codes.
Tell me where to dig?
Also, in theory, there is an option to ring the keyboard controller, and re-solder the wires from the key matrix in places. It makes sense?

Answer 1

habrahabr.ru/post/177405
habrahabr.ru/post/125298
habrahabr.ru/post/177347
www.cyberforum.ru/keyboards/thread605455.html
May help