Ok, I think im getting the idea behind what you’ve said above:
Player Pawn (MyCharacter) says when the player is overlapped and ‘e’ is pressed, send this through to the BPI
The BPI intermediates with other BP’s by sending this info through to my class BP or sequence of matinees in level BP,
thus keeping ‘press e’ commands out of the level bp.
So I created a Blueprint Interface
and then made your first picture set im my ‘MyCharacter’ pawn.
This is where im lost. I can go to a class BP and add the BPI with props but i cant create an "event Interact’ as in your second image.
Sorry but I’ve only started using UE this week 
Cheers for all the help!!!