SettingsUtil.cs

public static class SettingsUtil
{
    // 1. Instead of Factory.GetConfigNode(customConfigNode)
    public XmlNode GetConfigNode(string customConfigNode)
    {
        return ConfigReader.GetConfiguration().SelectSingleNode($"sitecore/{customConfigNode}");
    }

    // 2. Instead of Settings.GetSetting(name)
    public string GetSetting(string name)
    {
        var node = ConfigReader.GetConfiguration().SelectSingleNode($"sitecore/settings/setting[@name='{name}']");
        if (node == null)
        {
            return null;
        }

        return node.Attributes["value"].Value;
    }
}