Widget (or similar function) to unmount a USB OTG device? Is there a widget, app, or similar available to safely unmount a USB OTG device?

I've looked through this SE, Google Play, and the Internet and found this question, seedy/expensive apps, and old posts explaining the process in general, respectively.

I'm currently running OctOS, a modified CyanogenMod, based on Android 5.1, on a Samsung Note II.
I use an app called more shortcuts

It enables you to make system deep shortcuts and has widget functions.

Andy