But that does leave the original problem, to be fair 
How to know when the level is loaded?
I don’t think there is a way with ‘open level’, apart from using ‘begin play’ somewhere.
If the level was loaded using ‘load level instance’ then you do get something to bind to
It might be a good idea anyway to let each object load itself, that way, things stay modular, and you get to use begin play.