Someone did purchase a flip key from Ebay, transferred the RFID, and made it work. There is a How-To thread on it somewhere. There is also a How-To thread on making a Fusion key with key fob controls built into the key to work in a Focus.
Ebay Flip key
Fusion- key with built in remote- mod
On the flip key, there are 2 available. One with electronics and one without, so you can purchase the one with the board, swap your RFID, then program the keyless entry part to work with your car. That's what I would do if I wasn't so lazy.