You cannot do that with a standard app. Only root access allows that level of UI hijacking.
If the stock launcher is still running in the background, your iOS module will lag. Use or App Manager (root) to freeze: ios launcher magisk module work better
To optimize an iOS launcher Magisk module and ensure it works smoothly, you must focus on rather than just app-level overlays. The best way to make these modules "work better" is to ensure they properly hook into the system's zygote process or replace system components systemlessly. Key Steps to Improve Performance You cannot do that with a standard app