just do it properly and swap the rear screen. It isn't hard, push the old one out and pop in the new one, its fiddly but doable in an hour or 2 depending how fast you work.
Sharpo says: (16:57:39)to be honest i dont doubt that half ggti users have a shortcut on their desktop for sharpie's last posts
£25 is a little steep for a rear screen though, I sell em for £10. Another thing to check is if your car has green tint glass or not, obviously you want the rear screen to match Look for a slight green tint on a pice of paper held up behind a window, and check for the word 'tinted' stamped on the glass near the part numbers.