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

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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

What I have tried:

I tried an always on top program to make the window to be on top however when I tried to put it on top of the game window the game covered the program