Retrofit rear wiper on '04 Prius?

Hi all,

I have a 2004 Prius (package #2) without the rear wiper. In other threads, people have said this accessory doesn't help them much, but I'm curious whether I could retrofit one on my car. Is it possible, and, if so, at what cost?

I imagine I'd have to start by replacing the rear glass. I wouldn't need the wiper to be wired to the dashboard; operation by remote control would be fine.

thanks--