Swapping KeyCode that will reflect on screen

I have 26 letters that are mapped by using KeyCode on screen, and when I press 'B' on my keyboard, then the letter B will light up on my screen.

This is what I want to do:

1. I want to swap physical key location, so "A" and "D" will switch places on screen.

2. Then, when I press the actual keyboard "D", I want the registered input to be A and A will highlight.

3. Finally, gradually increase numbers of keys that are being swapped.

So far, I got 1 and 3 with this code.

public class Shuffle : MonoBehaviour

 public float letterMoveTime = 1f;

 public List<GameObject> keys;
 IEnumerator shuffleCoroutine;

 Typer progressCounter;

 private void Awake()
 {
     keys = new List<GameObject>();
     keys.AddRange(GameObject.FindGameObjectsWithTag("EditorOnly"));
     // each gameobject keys have this tag.

     shuffleCoroutine = null;
     progressCounter = GameObject.FindGameObjectWithTag("Finish").GetComponent<Typer>();
 }

 private void Update()
 {
     progressCounter = GameObject.FindGameObjectWithTag("Finish").GetComponent<Typer>();
 }

 public void StartShuffle() // call this on button click
 {
     if (shuffleCoroutine != null) return;

     shuffleCoroutine = DoShuffle();
     StartCoroutine(shuffleCoroutine);
 }

 IEnumerator DoShuffle()
 {
     List<Vector2> startPos = new List<Vector2>();
     List<Vector2> endPos = new List<Vector2>();

     //List<KeyCode> startKeyCode = new List<KeyCode>(); this does not work.
     //List<KeyCode> endKeyCode = new List<KeyCode>(); this does not work.

     foreach (GameObject letter in keys)
     {
         startPos.Add(letter.transform.position);
         endPos.Add(letter.transform.position);

         //startKeyCode.Add(letter.GetComponent<KeyCode>()); this does not work.
         //endKeyCode.Add(letter.GetComponent<KeyCode>()); this does not work.
     }

     // shuffle endPos
     for (int i = 0; i < Mathf.Ceil(progressCounter.progressCounter/5); i++)
     {
         Vector2 temp = endPos[i];
         int swapIndex = Random.Range(i, endPos.Count);
         endPos[i] = endPos[swapIndex];
         endPos[swapIndex] = temp;

         //KeyCode tempKey = endKeyCode[i];
         //endKeyCode[i] = endKeyCode[swapIndex];
         //endKeyCode[swapIndex] = tempKey;
     }

     float elapsedTime = 0f;

     while (elapsedTime < letterMoveTime)
     {
         // wait for next frame
         yield return null;

         // move each letter
         elapsedTime = Mathf.Min(letterMoveTime, elapsedTime + Time.deltaTime);
         float t = elapsedTime / letterMoveTime;

         for (int i = 0; i < startPos.Count; i++)
         {
             keys[i].transform.position = Vector2.Lerp(startPos[i], endPos[i], t);
             //startKeyCode[i] = endKeyCode[i];
         }
     }

     // allow shuffling to occur again
     shuffleCoroutine = null;
 }

Does anyone have a good way to do this?