Do you have your stove manual? This is the link to it so you can download it.
custom.buyitsellit.com/18938/Guides/Corn%20Burning%20Stove.pdf
To remove the stirrer you have to slide the "tumbler collar" back off the end of the tumbler/stirrer. I suspect it has a set screw that holds it in place. The set screw has to be loosened with an Allen wrench. Good luck. The stirrer will have to be operated to turn the screw to a position that you can engage the Allen wrench. If you get the collar moved then the tang on the stirrer can be turned vertical so the burn pot with the stirrer can be raised up. Then the stirrer can be pulled to the right, then the left end of the stirrer can be raised up and the stirrer then will slide to the left and out of the burn pot.
If you get the stirrer out, when you reinstall it, don't tighten the set screw, just slip the collar over the tang. I think it will stay put.
As for the switch on the stirrer motor, I would mount it where you can get to the switch and at the same time see the stirrer so you know when to turn off the motor. The manual shows a wiring diagram.