I think this is fundamentally the wrong way to deal with it. Cookie persistence should be a client side permission. If user does not want to keep cookies, it is stored for the session and cleared on exiting browser, just like in incognito mode. With these permission dialogs controlled by the website, you are trusting these buttons to do what they say they do.
These consent forms are not about cookies. They cover all forms of tracking, whether by cookie, local storage, ip adres, browser fingerprint, or any other technique.
