Respooling messages - current best practice

Hello there,

I'm wondering what the best practice is for manually respooling messages on newer version of James.
Ideally, I would like to manually respool messages by moving them from the error repository  (e.g. file://var/mail/error/) to a watched folder.
Old posts on this list suggest that the FromRepository mailet could be used for this, but from the 2006 thread is not clear how FromRepository should be triggered.

Thanks and kind regards

Soeren