Depending on the amount of data you have, the translators will not take that much longer to translate all the unassociated symbol/cell data. Afterwards, you could use ALE to look for and remove unassociated symbols/cells/padstacks, as well as any other clean up that might be needed:
Thanks. Its not so much time I'm concerned over, but removal of old translated symbols and cells that were never/arn't used that could cause potential hiccups in migration. Don't want to waste any time fixing/correcting data thats not even used.