I've used a similar tool[1] before to convert all styles of an element to inline styles in order to copy it into a more isolated setting for testing, and it worked pretty well for me. There were a lot of manual steps for me to do this though, so CSS Scan seems like a pretty nice "one click" alternative.

[1]: https://www.npmjs.com/package/computed-style-to-inline-style

Good call.

Add in a * { background: none !important } and you're golden.

This is what I recommend to EVERYBODY who says to me "I've been thinking of learning x language."