Resort Transfers

I have recently bought a Trek 1.5 which is SpeedTrap compatible. The SpeedTrap itself is only around £15 but the computer to go with it ranges from £120 to £170. I think this is a little steep so was wondering whether someone either knew how to transfer the components from for example a Cateye computer or whether it could be synchronised with a different, cheaper computer. I would rather not have to resort to a sender attached to the fork is possible. Many thanks. Domenico.
I already know what John M Bike has said, I was wondering whether it's possible for anyone to change the circuitboareds from one to another or something like that?
Thanks.