EJB3 customizing/extending question

I have an EJB module with some stateless session beans in it. They all are quite obviously currently deployed.
I started down the road on the following thought experiment, which I'm fairly convinced is invalid, but thought I'd ask.
Suppose I "buy" that fabled EJB jar that you're supposed to be able to purchase from so-called component vendors. And suppose I want, for whatever reason, to treat that ejb-jar file as much like a black box as possible.
Now suppose that it ships with a WombatBean in it, whose ejb-name is WombatBean, and whose ejb-class is com.foo.WombatBeanImpl. Suppose I want to add an additional couple of attributes--semantically--to it, without cracking open the ejb-jar.
Could I:
* Write an EJB that extends WombatBeanImpl--suppose it's com.ljn.WombatBeanExtension--and pack it up in its own ejb-jar file
* Somehow convince the EJB container to map the ejb-name of WombatBean to "point" at com.ljn.WombatBeanExtension, such that com.foo.WombatBeanImpl is always "shadowed"?
I understand that I could sort of accomplish this and say that for all applications I know about I could go play games with ejb-refs and the like and point them all at my bean instead of theirs, but I guess I wanted to do this "underneath" the ejb-name they're all referencing.
Does this make any sense? Am I waaaay off base here?
Thanks,
Laird
P. S. If I can do this, but it's appserver-dependent, I'd appreciate those answers too. I'm using EJB3/JavaEE5 on Glassfish b32.

ejb-name is only guaranteed to be unique within the scope of an ejb-jar, so by definition if the other
ejb is in a different ejb-jar the ejb-names would not clash.
Regarding the issue of sub-classing,
it's not that you can't use implementation inheritance, where one of the super-classes happens
to be the bean class of an EJB component. The point is that there is no special notion of
component inheritance for beans. In other words, just because you write a class FooBean
whose parent is a bean class with an @Stateless annotation doesn't make FooBean an EJB.
FooBean would need its own component-defining annotation or an entry in an ejb-jar.xml that
declares it as a bean. In addition, some of the ejb meta-data in the super-class would not
apply to FooBean, such as its metadata for declaring which local/remote interfaces it exposes.
There is a lot of complexity in defining rules for processing of the ejb annotations
to support full component inheritance so the spec decided to limit this support to keep
things simpler.
--ken

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