[dcb]

Sort of. There are two polarizing layers, one behind the LCD glass and one in front.

First you have to cut the top layer off, or tear down the LCD and strip off the top layer.

Then you have to find replacement polarization film, or cut your original to fit.

But then in your HUD you will be shining blue light in your eyes, which is like the worst color for night vision.

I'm not sure which plane will be polarized at that point but you would want to avoid vertical for glare reasons. The bouncing off the windshield should give it some horizontal polarization which would attenuate the image if it is vertically polarized from the LCD.