Based on MyStaticCode.cs, a class that allows anything to run coroutines from anywhere.

CoroutineWorker.cs

using UnityEngine;
using System.Collections;

public static class CoroutineWorker
{
    private class Worker : MonoBehaviour { }

    private static Worker worker;

    [RuntimeInitializeOnLoadMethod]
    private static void Initialize()
    {
        var go = new GameObject("Coroutine Worker");
        worker = go.AddComponent<Worker>();
        go.hideFlags = HideFlags.HideAndDontSave;
        Object.DontDestroyOnLoad(go);
    }

    public static Coroutine StartCoroutine(IEnumerator routine)
    {
        return worker.StartCoroutine(routine);
    }

    public static void StopCoroutine(Coroutine routine)
    {
        worker.StopCoroutine(routine);
    }
}