Imagine you have a time machine and can go back to 1932 to redesign the Tuskegee

Imagine you have a time machine and can go back to 1932 to redesign the Tuskegee Syphilis Study. Describe what changes you would make to the original study in order to give the test subjects back control over their medical choices while still collecting data about whether there are differences in the presentation of syphilis within black bodies.