There's no plugin on the market that's like this but this one has some major flaws and is getting no support.
- If you try to redeem the rewards and its off cooldown, you have a chance of redeeming multiple of the same reward if you're fast because the timer in which it checks is too big of a number.

- If the reward is on cooldown it broadcasts to the entire server (not just you) that the reward is on cooldown... ?? 

Fix these and your plugin is a one of a kind and very useful. 

The plugin is currently unmaintained, so it would need someone to claim it and maintain it.