How can I report the advanced networking configuration as plain text?

You can use Microsoft's official DevCon tool, which can be run by the command line. From Microsoft's website, they describe it as:

The DevCon command-line utility is as an alternative to Device Manager.

You can get the tool here, along with the basic documentation. It's a very robust tool, and with a bit of tweaking and command line switches, should do exactly what you need.

You can use the > operator to stream the output from stdout to a file (e.g. devcon [args] > output.txt). You can then wrap everything into a batchfile and distribute it to your users.