**This is outdated** Unreal 4.17 and above has a rebinding feature built in that works with blueprint widgets: https://forums.unrealengine.com/devel...
• HTF do I? Blueprint Only Input Re/Map...
I will leave this video up for now, in case you are using an older version of the engine.
I was having trouble getting plugins to compile for key rebinding, so I found a way to do it in blueprints.