Well, some utility / support spells will have no chains or only short ones. If you make everything have those, maybe you could do it as you essentially learn more spells, you just pick them in thematic packs.
Hm. I'm actually reconsidering the whole chain idea, now that you bring up utility and one-off spells. Spells like invisibilty, charm person, most illusion spells and a ton of others only really work on their own, not as a whole scaling line. Eh.
Maybe I should just recommend the use of these converted spells with my SR system.