I just tried it, and I managed to get the post reversed & the saddle leveled, but it didn't seem to help very much with the fore/aft position; in fact I think I might even be farther from the knee-over-pedal ideal now. Weird.

Edit: I test rode it & it felt better than before, so I guess I'll keep riding like this and go from there. Why do you say you can't reverse it, by the way?