Buy a $200 soekris box and install openbsd or m0n0wall on it, or on any old pc you have lying around with 2 network cards.
(No, not my mom specifically; I gave her a router with Tomato installed for, among other things, exactly this reason. But not everyone has a technologist for a son, let alone one who knows what he's doing well enough to install m0n0wall on a Soekris box, or even Tomato on an old WRT54G*.)
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.