> 1. A filtering mechanism after the selection process. E.g., basic civics questions like how many states are there, a background check, and so on. To make sure you don't pick anyone that's compromised or incapable of serving.

This is a famously bad idea for U.S. politics.

Like, if you started a grass roots organization with this as your #1 idea, you'd have to eventually dismantle the entire edifice as 100% of your time would be spent answering questions about how this is different than tactics of the Jim Crow era. You'd also make yourself radioactive to any future grassroots efforts: e.g., "Citizens for an Educated Congress: wait a sec, is this that Jim Crow Guy again?" :)