Laptops have Fn keys to permit the F keys to do double duty. Those extra functions such as volume up/down, contrast up/down, airplane mode on/off, and display selection are performed by a software routine provided by the laptop's manufacturer. That's a long way of saying that no, there's no "replacement function key."
On the other hand, there's a whole slew of keyboard shortcuts: https://conetrix.com/blog/list-of-windows-7-keyboard-shortcuts and you can create your own: https://www.computerhope.com/issues/ch001130.htm
(see the link to AutoHotkey at the end)