PI3 + AMP+ and a Power On Button

I am building a "radio" with 5 buttons. One of the buttons (let´s call it OK) is Wired to PIN5 on the RPI to power the PI on. 

I know the AMP+ is using this PIN. Is it save that i also use this PIN for a Button? - I don´t think so. How can i turn on my PI with a button? What problems will it cause, when i use this pin for my button?

I tested, wiring a cabel on PIN5 and ground on the AMP+, its working but i don´t thing its save?

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