Martin. I hope you find more on Fred. Have you visited his website? Click on "Fred Dryer" website at the bottom of any of these pages. It'll take you right there.
Click on the pic of the duo for SK's site.
You could post a message to Kat, and ask her about Fred's other work. I think she has a couple of his latest movies. Maybe she can tell you how to get them.
Take care.