Why not use an EJB home method.
An EJB Home method is not specific to any entity.
(Perfect for batch processing)
To use it mention the method in the home interface
Then in your bean class place ejbHome<methodName> method (the return values and parameters must match, notice also capital first letter)
Combine this with an ejbSelect and you're done.
Does this help?
(excuse the typos but it this should give you something to check out)