There is no purely technological solution for the masses. Actually solving the problem requires either a political revolution to make shipping backdoors like this criminal rather than a favor to the government, or educating users enough that they can protect themselves with the existing technological methods that are easy to deploy given basic computer literacy. It's not really clear which one is less impossible.

Take orders on Kickstarter for "open source router".

You order the Soekris boxes on behalf of the crowdfunders. You image your chosen open source OS on blank CF cards, bundle the CF cards together with the Soekris boxes and ship these to the crowdfunders as the "open source router".

If you want to bring a solution to the masses out of the goodness of your heart and you are motivated, then nothing is stopping you.