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For student musicians there's a program called SmartMusic that uses a quality microphone to "listen" to them play a piece of music displayed, then showing them how they did: pitch accuracy; volume; length of notes played or rests held; etc. You could do the same sort of thing with this app, but for lettering. I think.

I've got a Wacom Intuos wireless tablet, and trying to kludge a way of using it for paperless, inkless practice. Mostly just loading up a screenshot of some alphabet I've found on the web, and using OneNote to annotate over with a pen. There are plenty of free alternatives to OneNote for this, like xournal or Jarnal. Maybe you could have a version of your project (great idea, BTW!) for people with tablets.