Hi Barney,
Your thoughts are most interesting.
Another idea might just interest you.
On the Propun weekly Newsletter they indicate horses that had no luck in running at their last start - Perhaps a stable of these using your criteria.

Re Dark Horse .I have been trying to get hold of the Dark Horse 2010 but without luck.

I feel that the best one ever bought out was the Ultimate Dark Horse of some years ago (thats still winning)
A Mr Charles Winston adapted the first one to improve upon it.
If you want a look email me at hotmail.

Cheers
darky