For anyone following this, I was about ready to run a really slooow script to encode the capture I made.
I was disappointed to find out after running telecide that there are fewer than 24 unique frames a second. Enough so that after decimate the picture is jittery.
This may actually look better interlaced. Not ideal, but at least it will be smoother.
Someone needs to cap an HDTV broadcast of this somewhere.