How to change the default alt shortcut for activating eyedropper tool while using the brush tool

Hey all,

while using brush for painting holding ALT key activates eyeropper tool, problem is right now my alt is not working and while waiting for the new keyboard I was thinking of changing that shortcut to something else? Is there any way to do this? Seems like I'm lost. I can't find this command in all the shortcuts section. 

Thx for any reply