Well, keep us posted on the results!
I've been thinking about this kind of Flash + mobile release strategy as well. What I think I might do with future projects is, have exactly the same thing for Flash and iOS+Android, the Flash version would be free and the mobile version would be paid. On the flash version there would be a link to the mobile versions, and on the description of the mobile versions there would be a link to the Flash version, so they can try the game. But the games would be the same. No demo / lite version or anything.
I like this idea, because if it's the kind of game that's simple / casual, they can play as long as they want with the Flash version, and if they want it on mobile, they can pay.
What I'm not sure of, is whether putting the Flash game up for sponsorship would be against the rules, however. I guess it depends on the portal. Maybe there are exclusivity periods: something like, 2 weeks just Flash, then you can release the mobile versions and add links to them inside the Flash game.