I would like to consolidate a dozen small 2-4 GB sticks that were created to install Operating Systems (Ubuntu / Windows), as well as apps such as Clonezilla. The .iso files for each stick is available.
It would be nice to "stack" the .iso files on a large bootable USB stick, that is outfitted with a boot mechanism that will allow the user to choose that .iso file (vs burning the .iso file to the stick). A bonus feature would be the ability to automatically detect newly added .iso files or removed .iso files and update the menu selection appropriately.
To clarify a constraint: I seek to avoid "burning" the .iso file to a partition of the USB stick.
What is the general class of applications that provides said capability to consolidate?
"All things being even": the preference is for a UNIX (Ubuntu) solutions to burn the USB stick