Rather than trying to imbed the image data in the file name, why not just use standard computer file management techniques? I image with two different cameras and three different scope configurations: QHY163M and QHY168C cameras; 130mm APO, 12" Meade ACF at F8 and at F6.
This requires an extensive set of flats and darks. Using directory names to group the calibration frames by category makes it easy to tell PixInsight what files to use when processing my images:
Charlie