I just tested this and it works, i'm able to move the HUD of the BGs:
If the BG HUD is shown enter into the chat:
Code:
/script BATTLEGROUND_HUD_FRAGMENT.control:SetMouseEnabled(true)
After that enter this.
Code:
/script BATTLEGROUND_HUD_FRAGMENT.control:SetMovable(true)
And now you are able to drag&drop the HUD of the BG if you click the shown keybind row on top of the HUD with the mouse and keep it pressed while moving the mouse.
You can try to combine the 2 scripts in one row like this:
Code:
/script BATTLEGROUND_HUD_FRAGMENT.control:SetMouseEnabled(true) BATTLEGROUND_HUD_FRAGMENT.control:SetMovable(true)