Looks like a similar concept to https://github.com/machine/machine.specifications which I used many years ago to try and achieve BDD style unit testing.

One point to note from your introduction was the following statement: I often find unit tests are hard to read, and especially harder to quickly identify what are the important pieces, or even what the test is testing about

Have you considered pairing with others in your team or using group code reviews to see if there is a style or understanding gap? This may be far more effective than trying to get people to use a novel unit testing framework with little or no real longevity.