When I worked for a large company and had to cross an international border that was considered risky (e.g. China) we were issued a special phone and laptop just for that trip. They were wiped after each use. If one was especially paranoid it doesn't seem unreasonable to destroy the devices after use.

This way we could consent to search because the devices were blank. It's highly inconvenient and I hope the US doesn't turn into a high risk border.