I understand what you're trying to do and share your sentiment about the car. Realistically, I think the best outcome you can achieve is to have a US state issue a registration for the car as an AFV (Alternative Fuel Vehicle).
This, however, is still not a manufacturer certificate. If that's what your state laws require, I think you're out of luck, there is no way you will ever get a flex fuel certificate for the ZL1 1LE out of General Motors, all the more because the car never came with this from the factory and E85 requires a tune at the very least, but potentially also fuel system capacity improvements. Even if you can somehow butter up a dealership to issue a flex fuel certificate on their own behalf, I doubt it would be deemed acceptable by your country's motor vehicle authority.
Also, as RamAir02 stated above, selling the ZL1 1LE was not allowed in Europe (see
this article), so importing it in the first place would be a significant achievement.