I have an automated tape library used by ADSM which will be out of
capacity in a few months.

I would like to take some of the cartridges out of that library and use
them with stand-alone drives, i.,e, a "manual" tape library.

Is there any way to move the cartridges as they are, without remounting
them all and copying all the data?

I would like to keep generating my backups into the automated library,
and move full tapes out to the manual library as needed.