Hello,
There may be better answers in editor settings or in key settings, or in c++ or with input files (or by the power of Rama ^^) but as you ask in blueprint section, i’ll do a possible reply with blueprint. I had to check recently and it seems that with blueprint, you need to set each key. You can easily use a global variable to dedicate each key to one or another action and all set keys will do the right action when variable is set. But i’ve seen, as i was looking on that, that there is a variable key events and key and mouse events, which in array may be usefull. I haven’t test it but i wonder if it could be possible to set keys in this array and with something like is pressed, find the index and do the right event. Once again it would a each key need to be set for all actions needed. Those are only ideas i would try in your situation. In hope that helps.
Edit : I have just remember the true power of Rama ^^ : [Full Project] Rama's UMG Rebindable Key System, Rebind keys at Runtime! - Community Content, Tools and Tutorials - Unreal Engine Forums!