Ok, I have at least one possible way to do it - assuming I correctly understand what you want.
The aqua object in the back is just an arch, to show the shape. They yellow one is using a letter A that is shaped like what you showed. I also tried it with a more blocky type of font, which I think looks better. That's the green one.
If that's anything close to what you want, I'll explain how to do it, using Pattern Along Path.
(click on the attachment to make it larger)