Why can't you? Disassembling a video game controller is amongst the easiest of electronics repair/modification.
Learning to Solder is a basic first step.
It gives you access to so much more modding capability once you get pass that first hurdle.
And the "Halls Effect Sensor" analog stick is one large entire unit, you literally desolder the old Potentiometer unit and just solder on the new "Halls Effect Sensor" unit.
They're designed to be "Drop In Replacements".
I know that but I don't feel that confident with the small spacing of solder pads. I've only done a few kits and other items where I felt confident I could do the build and odd occasional stuff related to my computers but only where I feel comfortable.
To top this off I also have a visual impairment so while it's a challenge I have learnt to overcome I choose carefully things I think I can do with minimal risk / fuss.