You seem to misunderstand how and in which case a ini file is useful/needed
Often I don't want a specific item name
This mean you don't need to store data related together, and that's why you should not use a ini file in this case.
Also, you can make a simple $calc in order to know the item name (n0, n1, etc).
All the nN should also be sorted automatically when removing and adding items.
This will break a lot of script, and again, ini file isn't designed to be sorted.
If you want to sort data, use another method of storing, or made your own method to automatically sort ini file