No other options.
Actually, I can think of another option:
Write a program for a given bean that:
(1) pulls out all of the existing beans. If they won't all fit in memory, then it can serialize them
(2) removes all of the beans in question
(3) re-enters them with the new information (possibly pulling them out of serialized form)
Then you could go one step further, and write a general purpose tool that will work on any entity bean that you point it at. Going even further you could put a nice GUI UI on top of it.
Surely this kind of tool has already been done?