I think the ID packs are just like desktops for your apps. If you delete an ID pack, your apps won't go away. Maybe wait for confirmation from someone else but I think you'll be fine. You'll just have to set your new ID pack up the way you want.
If that's the case, I'm not going to be able to delete the ID pack because I want to keep TeleNav as well as a couple of others that are not distributed in the play store, unless you know otherwise.