Oasis Poker

I read the Wizard's article about Oasis poker (similar to Caribbean Poker) and I have some questions. First, I'd like to clarify the rules in the casinos I play at - sharing information about your cards is allowed (everybody shows their cards to the rest of the players), switching one of your cards for the next card in the deck is allowed for the price of the ante (bonus pays 10000 to 1 for Royal, 1500 to 1 for straight flush, 500 to 1 for quads, 100 to 1 for full house and 50 to 1 for flush, bonus pays half of the prize if you switch a card), we use stardart pay raise table. Also, we play at 6 boxes (meaning we have 31 cards exposed).
Under these conditions, is it possible beating the house and if the answer is yes, how much is your edge? Also, having 31 cards open, what are the minimum requirements for bluffing (playing your hand even if you have less than AK432)?