I know that this is an old thread, but I have now done this procedure myself. I purchased a replacement steering wheel (actually from a Fiesta, which means that the LEDs behine the controls are red instead of blue). I removed the trim with the buttons from this replacement wheel and swapped them out with the original. I then enabled Cruise Control using the free FORScan software and an ELM327 ODBII device (USB).
The most difficult part was removing the airbag unit from the steering wheel.