Simple solution: have a charity handle the billing and generate a pass-code. I'm sure that someone at the EFF could be persuaded to create a custom page that

Simple solution: have a charity handle the billing and generate a pass-code. I'm sure that someone at the EFF could be persuaded to create a custom page that would generate tens of thousands in donations per year. (This ignores that there are a couple YC companies that can handle billing stuff.)