I had thoughts on something simillar to this. Either mounting a remote rad outside or in the loft. Props to you for actually doing it! The pretty valid warnings about condensation put me off though. It can get quite warm in my pc room (23C) so condensation would definitely occur. I have been warned that even having a rad next to the window pulling cold air in may cause the evil stuff.
Like I said, well done for thinking out of the box and may your luck continue!