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I could easily make the cable myself for dirt cheap since Flytec is nice enough to provide the pinouts of the cable in the manual, but I have never seen the socket that Flytec uses.

When all else fails, use brute force. If I were in your shoes, since I have the pinouts, I'd cut up the casing and solder my own standard serial port there, making it all rugged with generous helpings of hot glue. That way, the only thing between it and the host PC is a single easily-replaceable serial cable. Dongles break and fray too easily.

Or you could just jerry rig it. If you only need it to pull data once in a while, and if the conneciton doesn't have to be rugged, then just use some bits of wire and get some of the female pins out of a radio shack serial port kit, and attach those to the appropriate pins.