Cracked Screen CM13 Rooted VNC

I cracked the screen on my LG G3 running CM13. It's rooted but I can't get to a adb root shell because ADB root is not enabled by default. I want to clean up some stuff and VNC is my best bet. I installed VNC Droid Server but I can't click on Start to get it started. Instructions here require root over adb to start the vncserver manually. **Does anybody know how I can get a VNC server started on Android 6.0 without the ability to touch the screen?**