Well, they are not (or not seem to be) "genuine GM" flip keys, but there are modified flip keys compatible with our Omegas:
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I have turned both my keys to flip keys this way. The keys are exact clones from the Insignia flip keys (which are the only Opel/Vauxhall flip keys I've seen). You can't tell them apart. They are excellent.
They are modified in such a way that you just have to switch the electronics and transponder chip to the new flip key and that's it.
Of course, you'll have to cut the blade. There are stores that cut keys just with the key code. No need of mechanically copying the old key.
I've bought my keys from
this foobay guy, but later I've seen them for as low as 7$ in some obscure chinese page.
Beware of blade types and number of buttons. There are different kinds of blades. Mines where HU43A (they have "150" written on top of the blade). There are also flip keys to accommodate 2 button electronics.