New Post: Is there a way to AddHostType with the object named in a string?

I've asked this over on StackOverflow but have included the full question here to save your mouse.

I define JSengine as

    static JScriptEngine JSengine = null;

instantiate it in Main as

    JSengine = new JScriptEngine(WindowsScriptEngineFlags.EnableDebugging | WindowsScriptEngineFlags.EnableJITDebugging);

and then hook various C# objects into it, e.g.

    static void JSSetup(JScriptEngine jse)
    {
        jse.AddHostType("CSString", typeof(String));
        jse.AddHostType("CSConsole", typeof(Console));
        jse.AddHostType("CSFile", typeof(File));
        jse.AddHostType("CSFileInfo", typeof(FileInfo));
        jse.AddHostType("CSDirectory", typeof(Directory));
        jse.AddHostType("CSPath", typeof(Path));
    ....

What I want to know is this: Is there a means whereby I may Add an HostType by specifying it as a string so that I can do something like

    jse.AddHostType("CSPath",fergyTurtle("System.IO.Path"));

The reason for this madness is a desire to be able specify

    CSPath=System.IO.Path

in a configuration file and therefore be able to control what symbols get made available to the called script.