For almost the same price as that lid, you can get a Coleman Party Stacker that Anova recommends for container modification in this guide that they published a while back. I made one, and it's awesome, albeit more water than your current setup. I use it any time I'm cooking longer than a quick half-hour dip for shrimp. If that seems like more effort than it's worth, the setup you have now with an added dish towel and/or saran wrap would likely work nearly as well.