Good. At least it eliminates the camera.
The button is not soldered in. It has a plug that fits into the "Button/Slider" board inside the case. If you have some sharp nosed tweezers, or small needle point plyers, you can get the plug out without dismantling much, maybe not anything other than opening the case. Watch a couple YouTubes on opening the case. Pretty easy, but there are a couple really flimsy wires you have to watch out for as you open the case.
The button itself is removed by unscrewing the silver/grey collar on the outside. It's supposed to use a special tool to reach the notches without harming the button, but you may be able to get it off without damaging the plastic using more normally available tools. Once the collar is loose, it doesn't just slip off the button. You have to pull on it pretty hard with your fingernails to get it past the button part. The remaining part of the button comes out from the inside.
I'm not sure where you can get an OEM replacement. And I'm not entirely sure it's just a standard momentary contact button, but it might be.