So have an audio version available?

Literacy tests were not about literacy; the questions were often intentionally ambiguous (Think "What is the last letter of the first word?" or "Write backwards forwards."), allowing the instructor full discretion in passing or failing the would-be voter.

Predictably, nonwhite voters tended to be failed.

Then what I suggested bears no resemblance to a literacy test. You wouldn't need to "pass" the test, just simply take it in order to encourage you to consider the issues and how the candidates align with your views.

But I agree with the other commenter, selecting the questions in a fair way would be challenging.