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It's easy to calculate the slot club cashback rates on Frugal Video Poker.
Go to "Options" and click on "Calculate slot club cashback rates." When that screen comes up, choose the game you're playing, in this case 8/5 Bonus Poker. The game return will automatically come up - 99.1643%. Enter the cashback percentage -- .66% -- and your total value will appear without your having to add them yourself - 99.82%.
Actually, you're lucky that you already know the cashback percentage, but this calculator also works if you only know two other pieces of information, i.e., number of dollars to earn a point and number of points to earn a dollar.
This play is not quite positive, but could be if you're also earning a few comps.