Zombie Reviewing Cards

That sounds like a card formulation problem. And you should try to solve the root cause instead of trying out workarounds. You can read on card creation here:

You can do it using a little JS:

<div id="reveal" data-full="{{Back}}"></div>

<script>
  (function(){
    const el = document.getElementById("reveal");
    const message = el.dataset.full;
    let i = 0;

    // clear any raw output so nothing shows until JS runs
    el.textContent = "";

    const interval = setInterval(() => {
      if (i < message.length) {
        el.textContent += message[i++];
      } else {
        clearInterval(interval);
      }
    }, 200);  // 200 ms per character; bump up to slow it down
  })();
</script>

You can also use a hint field in the front of your cards, see Field Replacements - Anki Manual.