@Soulfox -- if you have thought about retrofitting a lighted keyboard to your laptop, forget about it. I once considered doing that and it is more trouble than it's worth.
Ah, but there is hope. It might be well night impossible to retrofit the keyboard you want, but you can do something about typing in low light situations by purchasing a USB-powered "worm light" designed to shine some light on your keyboard when you are typing in low light conditions. They are inexpensive, too.
Still, you are right. A backlit keyboard is a wonderful thing on a laptop. If you want one, you'd better purchase one on the front end.