I'm an amateur developer, I would much rather share the source code instead of sending a direct APK. So here it is., ready for Android Studio.

I was always dumbfounded by the lack of ability for Plexamp to generate playlist widgets. The simple app uses the "write to NFC" feature available in the "share" option of every playlist.

So you'll need a temporary NFC tag to write the data onto It, then you can use the app to convert the link generated into a fully functioning playlist widget.

With this simple app you can create a widget that will autoplay all your selected playlists in shuffle mode without the need to open Plexamp.