Hey,
i would recommend you to use a device like the Logitech G13 if you want more freedom over your movements, alternatively if you use the native mouse and keyboard support it should be possible to use double bindings on consoles.
The XIM would need both, a XIM Manager interface update as well as a Firmware update (so probably a lot of work) and its not even clear if Fortnite will not remove this from being useable in the game at one point.