I'm sure there are benefits and that might it help overall if implemented here and now in our current America with our current levels of public access to civics and career education (MAYBE.) However, this change would be the exact opposite or a total repeal of the Voting Rights Act of 1965, which good people died for. At a meta level, I trust those who died for voting rights to care more and know more about the correct answer to your question than I do, and I guess I would recommend to look back at historic speeches from MLK and other leaders to understand their full reasoning about why literacy tests were either irredeemable or undesirable, and their reasons for thinking so.
If we assume that both you and MLK were right, but that different policies better suit different conditions, then your proposal could maximize meritocratic effectiveness in an already-very-fair society, whereas MLK's way (the Voting Rights Act) provides a better minimum standard of human rights (similar to 1st and 2nd Amendment protections for people).