Just make your own... But if you feel adventurous - use the DSF Toolbox and open the pose files from G8.1 side by side with a saved copy of any basic pose from G9, and look at the naming conventions of each bone. They changed the spine names and some other bones, and a few have some mathematical tweaks (some + some -) to adjust. And some bones are brand new and not in the G3, G8 or G8.1 poses.
If you list them out for yourself and make a search and replace for those names in the copied file, and you add the missing parts lines, you should be able to fix any pose scriptwise to work with G9. Of course in the end, you need to tweak it and then resave it properly to a G9 pose file.
But that is all that Bone Minion actually does. The guy who makes them knows the algorithms and the name tag changes of each generation for all his Bone Minion converters.
I had the Bone Minion Beta but it had a date timeout and now doesn't work anymore.
AnjaBear