There was a question here a while ago asking about how to detach something from an actor. And the node you’d use is literally Detach from Actor… How convenient, Unreal’s naming conventions so clever and intuitive!
But then you run into the difference between the Dynamic Material Instance and Material Instance Dynamic
How do you call your instances? DMIs or MIDs? 
Is there a way to find out which blueprints have a particular blueprint interface implemented?
Almost certain OP is asking for something more involved. Not sure what exactly, though. Maybe something like Get Implemented Interfaces (not a node). This maybe:
So very obvious.
I stand corrected. It was straightforward.