And then those parts would be tariffed until non-viable for the same reason this was blocked and chinese evs are tariffed.

It's not a hardware issue at all. These cars are manufactured in the U.S. already, in South Carolina. The problem is the belief that the software allows for privacy violations under the control of the Chinese government.

Personally, I'd just prefer a privacy-enforcing system that applies equally to all manufacturers regardless of nationality, and apply these standards to everyone, but that's not really politically in the cards these days.

Well, USA could have allowed China to sell cars like everyone has been doing for 120 years. That didn't happen either.

As to why your plan won't work look up the law then look up FEOC.