I don't think that it is possible to clone the keys. But it is possible to make keys with a dump of the skreem modul.
Unfortunately I don't have the necessary hardware to prove it. A original Tango programmer with Crossfire module costs 1400$ and the clone should not work with Crossfire.
But I managed to repair a defective skreem module. Here is a video where you can see the repaired module in my car (unfortunately in german) password is "xf" (without quotes).