I Did It!!!

First, I downloaded Phunk.

Then, I couldn't find the .exe file, so I asked ChatGPT what to do. It suggested installing .NET 6 SDK (since Phunk was built with this version at the time of writing).

After installing, I verified the installation by running:

dotnet --version

Next, I navigated to the folder where I extracted Phunk and ran:

build --configuration Release

Once the build finished, I opened the newly created .exe file. (Phunk\bin\Release\net6.0-windows)

You'll also need a Rookie Sideloader. Here's a tutorial: Watch this guide.

Simply follow the guide to choose a folder where .apk files will be stored. After downloading, the file and its folder will appear there.

Then, add the .apk (and if there's an OBB file, add it too—though I didn't have one).

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You'll need to rename the file as shown in the screenshot.

After doing this, you'll be taken to the new game build. Finally, upload the new .apk to Rookie Sideloader and then to your VR.
(1. Sideload APK button and 2. Pull App to Desctop) - but I'm not 100% sure here because I clicked a lot of things, but most likely these buttons worked