What if you instead used example machines, say from each relevant group, and then from their inventory records went to the management tab and copied out everything from 'Policies with this computer in the Scope?'
System Information.app lists out MCX (called "Managed Client") settings in a nice Name and Value column format. It also lists Config profiles. The MCX settings are easier to read through that method, but either may work, and MCX may not be an option for you if you aren't using those.
You can export the Managed Client section or Profiles section out to a text file from Terminal that you can read through later. For example:
system_profiler SPManagedClientDataType > ~/Desktop/MCX.txt
Or export to an xml file
system_profiler -xml SPManagedClientDataType > ~/Desktop/MCX.xml
Same would work for exporting Profiles.
In our environment at least I can't see MCX providing nearly enough information to match what is in AD GPO.
It would be a combination of the following for us.
Policies
Managed Preferences
Configuration Profiles
First run scripts on the images
Last run scripts from Deploy Studio
...and probably a bunch of other stuff I have missed.
Then of course there is the fact that probably 3/4 of the Windows GPO's are either irrelevant or don't have an equivalent process on OSX platform, this would be the first port of call for me, to eliminate the ones that simply aren't relevant to the OSX platform.
I don't envy you my friend.
Thanks everyone! I totally forgot about System Information.app for some reason. That's the key. Thanks so much!