EZ Composites doesn’t work with PSPA database. However, if you use the EZ Composites CSV file, you shouldn’t have to separate into different folders. If you give it a CSV file only containing the images from a specific class then it will only open those images from the folder.
You would have to make a different CSV for each class though. Not sure how difficult it is to export PSPA data and configure for EZ Composites CSV formatting.