Read system clipboard as stream instead of string

If I have a massive amount of text on the system clipboard (e.g. 150MB text file), I'd like to be able to read the system clipboard from a stream as Unicode text so as to avoid an OutOfMemoryException. Is this at all possible by tweaking the pinvoke example below?

For these very large clipboards, Clipboard.GetText(TextDataFormat.UnicodeText) will return an empty string without throwing an exception.

Alternatively, if I use pinvoke like the example from here, I will get an OutOfMemoryException http://komalmangal.blogspot.ca/2016/04/how-to-get-clipboard-data-and-its-size.html

    [DllImport("user32.dll")]
    static extern IntPtr GetClipboardData(uint uFormat);
    [DllImport("user32.dll")]
    static extern bool IsClipboardFormatAvailable(uint format);
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool OpenClipboard(IntPtr hWndNewOwner);
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool CloseClipboard();
    [DllImport("kernel32.dll")]
    static extern IntPtr GlobalLock(IntPtr hMem);
    [DllImport("kernel32.dll")]
    static extern bool GlobalUnlock(IntPtr hMem);

    const uint CF_UNICODETEXT = 13;
    public static string GetText()
    {
        if (!IsClipboardFormatAvailable(CF_UNICODETEXT))
            return null;
        if (!OpenClipboard(IntPtr.Zero))
            return null;

        string data = null;
        var hGlobal = GetClipboardData(CF_UNICODETEXT);
        if (hGlobal != IntPtr.Zero)
        {
            var lpwcstr = GlobalLock(hGlobal);
            if (lpwcstr != IntPtr.Zero)
            {
                data = Marshal.PtrToStringUni(lpwcstr);
                GlobalUnlock(lpwcstr);
            }
        }
        CloseClipboard();

        return data;
    }