My goodness, I am certainly late to the table here.  I have just discovered the fabulous ConvertToUniversalPose utility in my Poser Pro software.

The python script maybe found as a Utility in the drop-down menu when you click on the Scripts option on the menu bar at the top of the Poser workspace.

The script will only work if you already have a humanoid figure in the workspace window.  I simply loaded Sydney G2 into it.

To be safe, I used a copy of my runtime with the physical ( not MAT ) poses which I needed to convert to Universal Poses.

When I clicked on the script, it asked me which Pose Folder I wished to convert.  It gave me a visual hierarchy of folders to select from - much like in the Operating System view.  You will recognise what you need to do once you see it.

The script asks whether you want to over-write the pose files you are converting from.  I chose NO.

I crossed my fingers that the script would recursively look through sub-folders as well - and yes it does !  

It also renamed the converted poses instead of over-writing the original poses.  Perfect.

What you will see is a window of text informing you of the pose files which the script is converting for you.  And, SydneyG2 is posing along with each pose... hmmmm.  So all the poses get converted for Sydney G2.

So.  Nice little script.

Eternal Hobbyist