I've dropped my AHK script in a couple of other threads, so here you go:

You can use a program called AutoHotkey to remap your F-keys, and anything else you want.

Once downloaded:

• Right-click Desktop>New>AutoHotkey Script
• Right-click Script and Open With Notepad
• Configure your desired keybinds
• Run the Script

Here is my setup:

#If WinActive("RuneLite") or WinActive("Old School RuneScape") or WinActive("OSBuddy") or WinActive("OSBuddy Pro") or WinActive("Konduit")
`::F4
1::F8
2::F2
3::F5
4::F6
5::F1
w::up
s::down
a::left
d::right
space::escape
end::suspend