Hi Mart,
Apologies for suggesting a picture of the the keys I never considered the security aspect, but I sure we would not have got anywhere without them. Just edit the post and remove them.
I was just about to suggest the 'final' solution but I type slow!
To sum up, just to be clear in my mind
Remove the blade and immobiliser chip from the door fob key. In theory if these can be replaced by the blade and immobiliser chip from the ignition key we will have one functioning key fob. This is unlikely as the blade of the non oem ignition key will not be compatible and a compatible copy (from a image) will need to be cut. In the event the immoliser chip is also incompatible a new virgin immobiliser chip will have to be coded to the ECU.
Think I've got it, but don't forget in this solution the 'new' key will not manually unlock the door in emergency.and the original door blade key will have to be carried on the key ring.
Sorry again about the security aspect.
Andy