Load Scene and move player to start position

This seems a basic requirement for multi-scene games. All I want to do is have my player collide with an invisible object and change to a new scene at a specific vector3 position.

Here is the code that I have tried, attached to an invisible box collider.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class LevelChanger : MonoBehaviour
 {
     static int prevLevel = 0;
     public static int currentLevel = 0;
     public int toLevel;
 
     public GameObject playerObject;
     private Transform startingTransform;
 
     private void Start()
     {
         startingTransform = playerObject.transform;
         if(playerObject == null)
         {
             playerObject = GameObject.FindGameObjectWithTag("Player");
         }
     }
 
     private void OnTriggerEnter(Collider other)
     {
         if (other.CompareTag("Player"))
         {
             if (SceneManager.GetActiveScene().buildIndex == 1)
             {
                 prevLevel = SceneManager.GetActiveScene().buildIndex;
                 startingTransform.position = new Vector3(-152.6352f, 163.67f, 242.283f);
                 SceneManager.LoadSceneAsync(toLevel);
                 if (playerObject == null)
                 {
                     playerObject = GameObject.FindGameObjectWithTag("Player");
                 }
                 return;
             }
             else if (SceneManager.GetActiveScene().buildIndex == 2)
             {
                 prevLevel = SceneManager.GetActiveScene().buildIndex;
                 startingTransform.position = new Vector3(501f, 1f, 537.209f);
                 SceneManager.LoadScene(toLevel);
                 if (playerObject == null)
                 {
                     playerObject = GameObject.FindGameObjectWithTag("Player");
                 }
                 return;
             }
             else if (SceneManager.GetActiveScene().buildIndex == 3)
             {
                 prevLevel = SceneManager.GetActiveScene().buildIndex;
                 startingTransform.position = new Vector3(-891f, -57f, 332f);
                 SceneManager.LoadScene(toLevel);
                 if (playerObject == null)
                 {
                     playerObject = GameObject.FindGameObjectWithTag("Player");
                 }
                 return;
             }
         }
     }
     void OnLevelWasLoaded(int level)
     {
         if (playerObject == null)
         {
             playerObject = GameObject.FindGameObjectWithTag("Player");
         }
         playerObject.transform.position = startingTransform.position;
     }
 }
 

Yes, I know all of those FindGameObjectWithTag entries are costly, and switches might be more efficient, however I am not interested in pretty, just functional. This is all attempts to by-pass null refs and/or get it working on a basic level.

Does anyone have a simple script to change levels and specify where the player should start?

Mark