PDS can generate IDF files (Intermediate Data Format) while creating isometrics. Some programs such as I-Sketch, I-Run, Spoolgen, etc. can read IDF files and convert them to PCF files. I've not seen IDF to PCF convertor.
I've prepared a procedure some years ago and it may help you. You can find it in the following link.

http://www.coade.com/ubbthreads/attachments/828-PDMSTOCAESARII.pdf