I have updated the Hybrid Choices extension by AW Freyr so that it compiles for Inform 7 v10. At the very least, it works for the first three examples (up to Temple of Fear), which I’ve updated. It’s not thoroughly tested and I haven’t updated the documentation. Much of the syntax for defining choices and pages has to be different now because of the changes in v10.
Anyway, if you’re interested in choice-based development in inform 7, feel free to check this out, and let me know what’s wrong. I’m not sure what the copyright/licensing situation is…