One idea would be for a big pop-up window to appear when the player is about to make a deposit saying something like
"You will receive a bonus of $xxx with this deposit, however you cannot play xyz games or request a cashin until you have gambled a total of $xxx"
They could either proceed with the deposit and get the bonus knowing what they can play and how much they have to wager, or opt there and then to deposit without the bonus and have no restrictions.
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