PolyCal VS FoxMagiskModuleManager

PolyCal: colorful, text-based calendar widget

You can use an up to date MicroG installer Magisk module. There should be one/some in the repos this app uses: Fox's Magisk Module Manager.

For Magisk modules you install the .zip files via the Magisk app or using the magisk executable binary (magisk --install-module /path/to/module.zip). For example the Fox's Magisk Module Manager app makes use of that command.

So, as far as I know there are two options to help with this via magisk. One is called audio miscellaneous settings, and the other is called VIPER4ANDROID. They are both in the androidacy repo and accessible via the Fox Magisk Module Manager.

Fox's Magisk Module Manager (version 1.0.2): A module manager for Magisk because the official app dropped support for it.

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With the Magisk module called OverlayFS you should be able to "write" to the read-only partitions, as it's used to emulate changes on the read-only partitions. You can use Fox's Magisk Module Manager app to find & install it from that repo.

Available in the Fox Magisk Module Manager for example: https://github.com/Fox2Code/FoxMagiskModuleManager

You can also install the Hide USB debugging & Hide userdebug modules by the same developer behind Magisk-delta. You can find these and more modules by using this app: https://github.com/Fox2Code/FoxMagiskModuleManager or searching in Magisk-delta's Telegram chat/channel btw.

You can either download it directly from the repo, itself, within the Magisk Modules Alternative Repository, or via Fox's Magisk Module Manager, which I prefer personally, just because it's a nice way of updating modules