Sounds like you could use the AppDomain.AssemblyResolve event and manually load the dependencies from your DLL directory.
Edit (from the comment):
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.AssemblyResolve += new ResolveEventHandler(LoadFromSameFolder);
static Assembly LoadFromSameFolder(object sender, ResolveEventArgs args)
{
string folderPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string assemblyPath = Path.Combine(folderPath, new AssemblyName(args.Name).Name + ".dll");
if (!File.Exists(assemblyPath)) return null;
Assembly assembly = Assembly.LoadFrom(assemblyPath);
return assembly;
}