I have updated the exporter script. It is able to write out .gpmesh, .gpskel files as well as a .gpanim file for each action (=animation) from blender. See the documentation at the top of the script what has to be taken care of so the data will end up correctly in the files. Maybe I can add some more controls to the exporter-dialogue to take care of that. Otherwise the script has worked very well for me.
If someone has time to test this and wants to provide feedback, please do so :) I will do my best to fix any issues that may occur :)
Thank you.
Best, Michael