Your custom font/text-on-a-path idea is a workable solution, but I think Ted's suggestion of using a custom particle in a particle system is a better one. Particular, if you have it, CC Particle World if you don't. Just make the emitter follow the stroke path and set the velocity to nothing.
- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.