Hey Folks 
There is an Application - Developed by the same One Man show of company St. Clair Software - which is better known for Default Folder X.
It’s called Jettison and a very powerful automation friendly nifty little Application.
I‘m going to by this app for my self - have only tested it so far and this application is a game changer for handling external drives.
Edit:
I don’t even know why I haven’t bought it ten years ago when buying Default Folder X … such a waste of time ….
Greetings from Germany
Tobias