How do I load my own Reality Composer scene into RealityKit?

Question

I have created 3 "scenes" inside Experience.rcproject file, that is created when you start a new Augmented Reality project using xcode.

Working for 3D a lot, I would say that these were 3 objects inside a scene, but inside Experience.rcproject I have added 3 "scenes". Inside each one, the same 3D model. The first one is attached to an horizontal plane, the second one to a vertical plane and the third one to an image.

I am woking with Reality Kit for the first time and learning along the way.

My idea of doing so, is to load the right object when I want to have it attached to the horizontal, vertical or image.

This is how I accomplished this.

I have modified Experience.swift file provided by Apple to accept scene names, like this:

public static func loadBox(namedFile:String) throws -> Experience.Box {
    guard let realityFileURL = Foundation.Bundle(for: Experience.Box.self).url(forResource: "Experience", withExtension: "reality") else {
      throw Experience.LoadRealityFileError.fileNotFound("Experience.reality")
    }
    
    let realityFileSceneURL = realityFileURL.appendingPathComponent(namedFile, isDirectory: false)
    let anchorEntity = try Experience.Box.loadAnchor(contentsOf: realityFileSceneURL)
    return createBox(from: anchorEntity)
  }

and I call this line

let entity = try! Experience.loadBox(namedFile:sceneName)

whatever I want, but I have to use this code:

// I have to keep a reference to the entity so I can remove it from its parent and nil
currentEntity?.removeFromParent()
currentEntity = nil

// I have to load the entity again, now with another name
let entity = try! Experience.loadBox(namedFile:sceneName)

// store a reference to it, so I can remove it in the future
currentEntity = entity

// remove the old one from the scene
arView.scene.anchors.removeAll()

// add the new one
arView.scene.anchors.append(entity)

This code is stupid and I am sure there is a better way.

Any thoughts?