Using the same key to activate and deactivate event in blueprint

As the title says I want create an event using the key ‘e’ to activate it (so far I’ve come) and also to deactivate it afterwards.
There should be no timer. The event lasts as long as player doesn’t press ‘e’ again.

What is the simplest way of achieving this? The first part I’ve got but how can I reuse the same key without negating the activation from the start?

Thanks in advance…

Use a flipflop off the pressed exec pin