I emailed Anthony yesterday and asked about a possible solo variant for Pocket Odyssey. He didn't totally shoot the idea down, which I was glad for! He mentioned the possibility of a downloadable PDF with rules for solo play.
If anyone else is interested in such a thing, perhaps you could post in this thread to express your interest in an official solo variant for Pocket Odyssey. The more the merrier, and the greater likelihood it will become a reality!
Solo play would be interesting, but first I want to know how is it with two?