You know what?
I may have opened my trap way too early. As I look at the process more closely, you can indeed train the transcriber, only the training you do is to eliminate the ways in which you don't draw a character. For example, it presents you of three different ways to draw the capital letter 'A' and five ways to draw the lower case 'a'. You can then rate how often you draw the letter in each example.
My bad if I gave you false hope.