I did this. I put DPX2CF in my DNG folder
DPX2CF *.DNG test.avi -q6 -f 23.976
The resulting Cineform RAW file takes about 2 seconds to create, contains both 1 second clips and is 63MB in size
As for ease of use, maybe I'll start playing around with making a batch file gui that makes it simpler to use. Lots of easy to use programs that do that.