I do not believe they intend to implement the HUD. I vaguely remember one of the devs mentioning as such, and saying there’s only a very small number of real world Longitudes that are equipped with functioning HUDs. Maybe I’m misremembering, and also not remembering the full details, but my general conclusion from what I read was to not expect or anticipate for the HUD to ever be functional.
Hopefully somebody can correct me and prove me wrong though. I would very much like that.
[edit to add below the comment I remember reading]