Sadly this kind of thing is not possible anymore on modern consoles, due to the highly locked-down protocols they use.
All the recent generations accept USB controllers, is there really much locked down in there?
Have you seen the xbox adaptive controller?
You can still just direct solder to any of the shelf controller pcb to make your own devices. There are also more resources out there than ever before for creating your own inputs.
https://youtu.be/Ug06dhahqg0