it'll all backfire
the GBP will take Dee's 'journey' (from channel 4 to channel 5, how Odyssean), in addition to her close lifestyle similarity with the voters, into consideration. I use 'consideration' loosely since these people are incapable of thought or sustained analysis of a housemate's character over the entire series (see: Helen winning)
not to mention the fact that we Brits would never dream of letting an American win one of our esteemed shows.