Adding an additional launcher to my phone does not appear to be as seamless of a solution as I would like.
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That said, on Android it's possible to replace the home screen launcher with another one. My favorite is Nova launcher but as far as I know Nova doesn't let you lock the app drawer https://play.google.com/store/apps/details?id=com.teslacoilsw.launcher
What are you trying to accomplish by locking the app drawer? There might be a better approach if we knew what you are trying to do.