EDIT: Minus the ridiculous 20 BTC fee for getting an MPEX account.
You would have to rely on a pass-through, which adds a lot of risk and complicating factors. I'd rather pay the 20 BTC fee and do it myself.
edit: a broker would give you fewer risks (compared to satoshidice/evoorhees, mpex, glbse, passthru operator, it would be just satoshidice/evoorhees, mpex, broker), and likely less fee than the passthru 5% cut of the dividend.