Is there a more efficient way to make events for keyboard key presses?

I'm trying to use events to handle keyboard key presses instead of calling a function each time a key is pressed, to make the game easier to work with.

The issue I'm having is that creating the event for a single key is quite long, and will have to be looped every frame in Update(). This seems inefficient, after a while you are looping through a couple hundred checks per frame. I read up on EventType.KeyDown, EventType.KeyUp,and Event.current , but was unable to figure out how to use those instead of making my own events.

Thoughts?

 public delegate void UpButtonHandler();
 public static event UpButtonHandler UpButtonHeld;
 public static event UpButtonHandler UpButtonUp;
 
 private static void UpButton(){
     if (Input.GetButton("KeyUp")){
         if (UpButtonHeldEvent != null)
             UpButtonHeldEvent();
     }
 }
 private static void UpButtonUp(){
     if (Input.GetButtonUp("KeyUp")){
         Debug.Log("working?");
         if (UpButtonUpEvent != null)
             UpButtonUpEvent();
     }
 }

Edit:

Just discovered:

     public void test(){
         if (Event.current.keyCode == KeyCode.W){
             Debug.Log("Event works");
         }
     }

This seems to work, but it has to be ran in OnGUI(){}. Is there any disadvantage to running something like this in OnGUI vs Update() ? I also can't think of a way to add subscribers to such an event.

Day 1 Edit: Started using the first example in my application, though am still very much interested in the 2nd Event.current and how I might be able to make a subscriber to that event, as well as the performance of the first way.

Day2: Still was unable to find out much more than this. The events work well (amazingly well) though. Edited example a bit.

Day5: Not finding out much more :/