That sounds like an awesome tool! At some point I was back-and-forthing with my colleagues, via email, to work something out, we must've created a dozen gists, in the period of an hour.
I had a ten-second look at the etherpad embedding link, and it uses an iframe for it. Wouldn't that prevent styling for the syntax highlighting? I'm not sure how that would play over iframe boundaries, since it wouldn't be
And to contribute: Last week I discovered that etherpad also has an export API.
If you append the pad URL with
/export/txt you'll get the raw version (also works for other formats, e.g. html, pdf, latex)
From the etherpad-lite backup docs:
curl -o mypad.txt https://beta.etherpad.org/p/progress/export/txt