WebMethods class loaders

Is there a way to chain into the webMethods package classloaders?

I’ve been able to hack my way in by exposing the package access properties of com.wm.app.b2b.server.ServerClassLoader, but I’d like a cleaner, and preferably supported approach to accomplishing this task so that I can attach a URLClassLoader to my package for dynamically downloading client code from a remote J2EE server.