Are you trying to solve a technica, or political/moral problem? Let's Encrypt doesn't create, see, store or log your private cerficates. So, even if they are in the US, I don't see a risk, and otherwise, the other parts you use in general are probably vulnerable to the problem even if non-US.

For ex. the US could simply order browsers stop validating any certificates not issues by US companies in browsers. And whoosh. Having a non-US certificate won't help much there either.