[Google Pixel 3 XL Themes, Apps, and Mods] StykerB:
Untested on the Q Beta!

For information about the way the mod functions read this.

This mod is possibly dangerous given its nature of modifying the safeguards built into your phone by Google. I am not responsible for your actions using this mod. This mod is meant only for Pixel 3 and 3 XL devices, I would recommend against trying this on other devices.

All that being said I use this mod daily and decided to share. Attached is a ".flo" file used by the app "Automate," link to download from play store, to import the flowchart for the mod. The reason I used automate instead of the typical Advanced Charging Control Magisk module is due to the module having much more functionality that I didn't need or want. Examples include weird charging behavior with USB-PD chargers and overall charging instability. This also allows the mod to be disabled by booting in safe mode.

Details about the mod:

This mod may stop working after any android update

This mod seems to even allow non "fast charge" wireless chargers to be faster

This mod allows a max of 9v to be accepted through wireless charging instead of stock 5v without Google Certification.

This mod reverts whenever the phone stops charging (this is the part that this Automate Flow automates)

Details about the Flow:

This Flow requires 2 apps (Automate and Automate superuser permissions plugin) be installed from Google Play Store

This Flow requires superuser permission on the device (Magisk recommended)

This Flow does NOT modify /system

The file that is modified by the Flow is reset upon unplugging/lifting off a wireless charger so uninstalling Automate will undo the mod completely

The Flow runs like this:

Wait for wireless charging state to change

If wireless charging connected: run shell command then Go to 1

If wireless charging disconnected: Go to 1

So if the phone is not charging or cable charging there isn't an endless loop running.

Instructions:

Download and extract the .flo file

Download Automate app if you have not already

Open Automate app and go through its first time setup

Use the 3 dots menu in the top right to select "import"

Navigate to where you extracted the .flo file and select it

Select the new Flow that just appeared

Under Privileges check the checkbox "full (superuser) access..."

Google play store will prompt you to download the superuser permission app for automate

Grant superuser to automate

Press Start, you'll get a persistent notification about the flow running

OPTIONAL: Go back to Automate app's settings and check the "run on system startup" to enable the mod on boot

You can verify success based on the log in Automate or by observing the charging text on the lockscreen/ambient display. If it says "charging slowly" then the mod failed if it says "charging" then the mod succeeded. You can also check in apps such as Ampere, the charging current pre-mod for me was always <600ma and up to 1200ma after. Note after ~70% charge the Pixel 3(xl) seem to slow charging speed so have a <50% battery for a good comparison.

To uninstall the mod just uninstall Automate or open the Flow and then in the 3 dots menu press delete.

EDIT: Now available in Tasker flavor for those of you who use Tasker and don't want a second automation app running on your phone. Just open the .XML file and select open with in the top right and then Tasker on the pop-up.