Joystick for people without fine pincer movement

This object is designed to primarily help those who do not have great movement with their forefingers and thumbs, forming the famous forceps and use a motorized chair . This was inspired from my own needs when I got a motorized chair, last year.
The motorized chair that I use came only with a joystick model in pyramidal (conventional) shape . However, for my needs, this format is not very functional , since my forceps movements are limited , difficulting to control the chair.
So, I developed