Yes, I think I might find it useful to also create them automatically when I create the sprites later.
One option of course is to have one object of every type placed in the editor (as you should do anyway since it helps construct load the objects you need in the startup) and have the string data saved in that object, so all the objects that get created after that will use that object's variable data as default. After that you can put those objects in a family "DestroyAtStart" and destroy them in layout start, and it apparently won't affect the objects' default variable data when created later on.