You probably have more than just keys to program if you have had to replace your ECU. I understand its pricy, but unfortunately this was a risk you took when you shipped your ECU out to have it programmed. I don't know your exchange rates, or even what currency your price quotes are in, so I can't say how expensive it is or isn't, but I think you're better off just biting the bullet, having it done, and just cut your losses where you're at, instead of messing around with a controller that isn't right for the car, and breaking more of its electronic systems.