My grandfather bought flip keys for his Mercedes, they look just like the last pic. They are the coolest key I have ever seen, its a key built into a remot, and its so much to keep flipping it open and closed. With his Mercedes (1999 S320) came with the standard keys but he purchased the new keys and the dealar was able to program them to his old Meercedes. If BMW is the same then it could be possible to program the flip keys to the older cars.
But as beemerworld said they were never available for the BMW so you cant get them anyway.