I don't want an even playing field. I want my country to have the advantage. It shouldn't come down to a 50/50 coin toss whether to offshore or not because they are seen as equally expensive.

I also don't think it would play out that well. If you are offshoring to country B but forced to use a factory following standards from country A you aren't going to be able to compete against a company from Country B using the best factories from country B. In my view you should either try and beat them at their own game by using equivalent factories or you should not outsource and use innovation to come up with a more efficient factory. Purposefully choosing an inefficient option leads to an inefficient economy.