here is my example, its just a fast way, i dont say this is the best way to do it 
please note: i always used custom function, to have the logic more encapsulated and its easier to read through BP like this (my own feeling).
So except the 2 Events inside InteractableCube, i created one function for each codepart.
I havnt used the Remove inside my example but i just wanted to show you how to get rid of a widget reference
happy coding