BuildKCCPlatform.cs

/// Add this script to the parent of colliders you wish to sync to the root rigidbody

using KinematicCharacterController;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BuildKCCPlatform : MonoBehaviour
{
    public Transform source;
    public bool destroySource = false;

    void Start()
    {
        if (source == null)
            source = GetComponentInParent<Transform>();

        GameObject go = Instantiate(gameObject);
        go.transform.localScale = transform.lossyScale;
        Destroy(go.GetComponent<BuildKCCMover>());

        var children = go.GetComponentsInChildren<Transform>(); // alloc

        for (int i = 0; i < children.Length; i++)
        {
            Transform child = children[i];

            if (!child)
                continue;

            child.gameObject.layer = 9; // HARDCODED LAYER!!

            // if one of the children has a mover, destroy it
            if (child.gameObject != go && child.GetComponent<BuildKCCMover>())
                Destroy(child.gameObject);
        }

        var moverTets = go.AddComponent<KCCGhostPlatform>();
        moverTets.sourceObject = source;
        go.AddComponent<PhysicsMover>();

        if (destroySource)
            Destroy(gameObject);

    }
}

KCCGhostPlatform.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using KinematicCharacterController;

public class KCCGhostPlatform : MonoBehaviour, IMoverController
{
    public Transform sourceObject;

    PhysicsMover _mover;
    PhysicsMover mover { get { if (!_mover) _mover = GetComponent<PhysicsMover>(); return _mover; } }

    private void Start()
    {
        mover.MoverController = this;
    }

    public void UpdateMovement(out Vector3 goalPosition, out Quaternion goalRotation, float deltaTime)
    {
        goalRotation = sourceObject.rotation;
        goalPosition = sourceObject.position;
    }
}