For what it's worth, lack of color and variety in the canon was part of what broke me from The Well-Trained Mind and that mode of homeschooling. Yes, I understood that the "canon" is essential for being able to comprehend a lot of Western culture, but there's honestly not that much that has to be read for that. Shakespeare, a working knowledge of the basic bible stories, and the Greek myths. Otherwise? Forget it. I threw out the canon and went for my own stuff, adding in writers of color and women (and female characters) and so on. Not to mention that I think reading Feynman's Six Easy Pieces and works by Michio Kaku and Neil DeGrasse Tyson are FAR more important than Aristotle and Euclid.

So keep the format, perhaps, of what works for you from the book, but make your own canon. As far as everyone else is concerned, the "canon" won't change if we don't change it at some point. Might as well do what we can when we can.