How to pin a window on top of a borderless fulscreen / fake fullscreen?

I used Autohotkey to make a borderless fullscreen for my games. The main reason I did this is because I wanted to pin a window on top of the game. However the game window is always on top. It kind of defeats the purpose of a borderless fullscreen. Therefore is there some kind of method like a Autohotkey script or something to pin it on top and always keep it there.
Btw this is the script which I used

^!f::
WinGetTitle, currentWindow, A
IfWinExist %currentWindow%
{
WinSet, Style, ^0xC00000 ; toggle title bar
WinMove, , , 0, 0, 1920, 1080
}
return