I know how to do it. It's easy if you know how to use DXTbmp, GIMP or Photoshop. Same procedure as skin mod.
But 2 issues: 1- every update you'll have to reinstall it, so you need to backup it.
2- I noticed that in multiplayer, at least in BURNING SKIES server doesn't allow you to spawn with any mod. It's a kind of anti-buggers system.
Fare enough, but as you said this new "all in green" windshield reduces, even more, your spotting capability.
So crossing fingers we need to wait for an official fix for playing MP.