For simply HUD view You don't need "mirror-inverting' program/script.
It is possible by changing icons (mirror it in graphic program - gimp, paint etc).
I think it is possible now - editing icons, and changing colors (without map projection). Only arrows, maybe by changing fonts (by edit and mirror it) You can see street names and distance information.
Look at:
http://forum.mapfactor.com/discussion/4139/lets-talk-about-hud-head-up-display#Item_6
At night, with special foil looks good.
(edit)
One hint - try use mirror to 'convert' view.
I tried, and it works, but better without it, just mobile and good handle.
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