Haven't ever seen one of these but is it not possible to get a key number from somewhere like auto security codes or Hickley's and then maybe enquire to see if a rpm module can be used if you can somehow source the immo code.

If its similar to the 1999 Megane I'd think its a 4 digit code so may have a chance of an emergency overide.

Other than that is it possible for a complete immo off solution.